Flyer und Broschüren - Photovoltaik

Die von der Bundesregierung beschlossene Energiewende sieht eine Erhöhung des Stromanteils aus erneuerbaren Energien (EE) auf 65% bis zum Jahr 2030 und auf mindestens 80% bis zum Jahr 2050 vor. Fast alle Energiesystemszenarien zeigen, dass die Photovoltaik (PV) neben der Windkraft die wichtigste Säule der zukünftigen Energieversorgung in Deutschland und weltweit sein wird. Nötig für eine erfolgreiche Energiewende in Deutschland sind nach Berechnungen des Fraunhofer ISE – je nach weiteren Randbedingungen – bis zu 500 Gigawatt installierte PV-Leistung.

Die Integration von Photovoltaik (PV)-Technologien in bereits genutzte oder bebaute Flächen unserer Umwelt erschließt ein riesiges Potenzial für die Stromerzeugung aus erneuerbaren Energien. Die Anwendungsbereiche sind vielfältig: Integrierte PV fügt sich nahezu unsichtbar in Gebäude- und Fahrzeughüllen ein, aber auch in Verkehrswegen, als schwimmende PV auf künstlichen Seen, als aufgeständerte Module auf Agrarflächen oder auf öffentlichen Plätzen im urbanen Raum eröffnet sie neue Möglichkeiten.

Integrating photovoltaic (PV) technologies into buildings, built-up surfaces or on areas already being used for another purpose unlocks a huge potential for renewable electricity generation. The areas of application are many and varied: Integrated PV fits almost invisibly into building envelopes and vehicle bodies, but also opens up new possibilities along roadways and railways, or as floating PV on flooded open-cast mines, as modules elevated above agricultural land or in urban areas as cover structures in public places.

Die Energiewende erfordert einen massiven Ausbau der Solarstromproduktion, verbunden mit einem hohen Flächenbedarf. Das Problem für Freiflächenanlagen: Ackerland ist eine sehr begrenzte und wertvolle Ressource. Die Agri-Photovoltaik (Agri-PV) löst diesen Konflikt, indem sie Lebensmittelproduktion und Stromproduktion auf derselben Fläche ermöglicht.

The energy transformation requires a massive expansion of solar electricity production, combined with a high demand for space. The problem for ground-mounted systems: Arable land is a very limited and valuable resource. Agrivoltaics solves this conflict by enabling food production and electricity generation on the same area.

The areas of application for flexible electronics are manifold and each comes with specific requirements. Producers of i.e. smart packaging or smart label solutions, heating foils or large scale sensor elements face the challenge to create conductors with precisely the required properties and in the desired pattern.

Gebäude haben bundesweit einen hohen Anteil am Gesamtenergiebedarf und an den Treibhausgasemissionen. Die bauwerkintegrierte PV (BIPV) kann die CO2-Bilanz eines Gebäudes wesentlich verbessern, idealerweise bis zum Nullenergie- oder Plusenergiegebäude.

Equipped with an excellent infrastructure and long-standing expertise, Fraunhofer ISE offers a variety of services for challenging functional printing applications like silicon solar cells, printed circuit boards (PCBs), fuel cells, batteries, sensors, electronic devices and more. We support material, equipment as well as device manufacturers in selecting suitable printing technologies, developing functional materials or innovative processes. We offer a wide range of characterization methods covering all relevant aspects from material and surface characterization to an in-depth analysis of electrical, optical and functional properties.

External quantum efficiency (EQE) measurements find widespread application for solar cell characterization. They yield depth dependent information on cell properties and quality and they enable single cell characterization in multi junction devices.

The FLATCON® module technology has been designed to meet the world’s highest conversion efficiencies from sunlight to electricity while being manufacturablein large volumes.

Nach aktuellen Schätzungen werden in Deutschland ab 2028 über 70% aller neu zugelassenen Fahrzeuge elektrisch angetrieben, ein Teil davon als Hybrid-Fahrzeuge. Integrierte Solarzellen können
die Reichweiten von Elektrofahrzeugen spürbar erhöhen.

According to current estimates, more than 70% of all newly registered vehicles in Germany will be electrically powered from year 2028, part of them as hybrid vehicles. Integrated solar cells can noticeably increase the range of electric vehicles.

Fraunhofer ISE offers a wide range of services for product development and material qualification in the field of module technology. With many years of experience, excellently trained scientific staff and advanced research laboratories – including industrial production equipment – we transform innovative ideas into reliable, efficient and competitive solutions. Together with our customers we develop new applications with integrated photovoltaics generating solar electricity from buildings, vehicles and roads.

Reference cells produced by Fraunhofer ISE are cutting-edge equipment for manufacturers of PV modules, laboratories and EPC contractors (Engineering, Procurement and Construction) worldwide.

Fraunhofer ISE CalLab PV Cells, one of the world’s leading calibration laboratories, provides industry and research facilities with comprehensive measurement services for a wide range of solar cells.

In shingle modules, rectangular cells are connected by edge overlap, an arrangement similar to roof tiles. The power output of shingle modules is increased by significantly enhancing the active cell area ratio within the module, decreasing shading losses, reducing cell interconnection losses.

High performing PV power plants are key to your return on investment. We offer monitoring services, which include immediate reporting of deviations from the expected performance.

The integration of solar cells into photovoltaic modules results in gains and losses that change the power and efficiency of the module in comparison to the initial solar cells. With SmartCalc.CTM Fraunhofer ISE provides a professional software solution to optimize solar modules and to analyze cellto- module (CTM) gain and loss factors.

Low concentrating photovoltaic (LCPV) systems utilizing industrial “one-sun” manufacturing equipment is an interesting path for producing low cost electricity from solar
energy. Fraunhofer ISE has extensive experience in solar cell technology, concentrating technologies and system development. We partner with industry to achieve the highest performance on the component as well as on the system level.

The technological work is accompanied by comprehensive analysis and qualification of silicon materials and solar cells which enable efficiency-limiting mechanisms to be
identified and material, processes and cell concepts to be systematically improved. Using a large variety of state-ofthe-art offline and inline metrology systems, we are able to measure all relevant quality parameters on starting wafers, solar cell precursors and finished solar cells on a statistically relevant basis. Metrology systems with high spatial resolution allow loss mechanisms of cells to be analyzed in depth. A well-equipped wet-chemistry analysis laboratory allows inlinemonitoring of chemical baths.

The share of photovoltaics in global energy supply is increasing rapidly. The dynamic PV module market is driven by high cost pressure and short innovation cycles. A large number of cell manufacturers and material suppliers for backsheets, encapsulants and others offer increasingly efficient and competetive products. The assurance of module quality is becoming outstandingly important for investors and manufacturers.

Along with the massive cost reduction for solar cells, building integration of PV (BIPV) is becoming more and more attractive. On the other hand, solar electricity production on building skins is increasingly required in public tenders.

Electrically conductive adhesives (ECA) have become an important alternative to solder joints for the interconnection of heterojunction solar cells (HJT) as well as for shingle interconnection in industrial production.

The generation of PV electricity depends on the sun’s position and the weather. In energy meteorology, Fraunhofer ISE develops algorithms to predict PV power for forecast horizons from a few minutes to several days. In order to support a reliable and costeffective power supply, PV power prediction is becoming increasingly important for solar energy trading, management of grid stability, reduction of grid integration cost for PV power.

Bifacial photovoltaic (PV) modules are able to utilize light from both sides and can therefore signifi cantly increase the electric yield of PV power plants. The yield gain compared to monofacial modules is mainly determined by the conversion efficiency for solar irradiance incident on the rear side of a bifacial PV module, and the amount and quality of solar irradiance incident on the rear side.

The professional quality assurance services of Fraunhofer ISE have been contributing to high performance and optimal yields of PV power plants for more than 30 years. Real world experience highlights the importance of system design, proper planning, engineering, component selection and construction work for successful PV systems. Thus, comprehensive quality assurance for PV power plants covers all phases of the completion process from the planning to system operation and maintenance.

Multiple factors affect the reliability and long-term performance of photovoltaic modules. The quality and characteristics of the used materials, the interaction of the components, the manufacturing process and, of course, the local climate at the operating site play a significant role. 

At Fraunhofer ISE we use high-resolution analytical methods to assess degradation indicators and mechanisms. These methods serve as powerful tools that  complement the current-voltage (IV) measurements.

Die klimatischen Einflüsse, die auf Solaranlagen einwirken, sind je nach Standort sehr verschieden. Dadurch ergeben sich unterschiedliche Anforderungen für Materialien und Komponenten von PV-Modulen und thermischen Kollektoren. Um die Auswirkungen der unterschiedlichen Witterungseinflüsse auf die Beständigkeit von Solarkomponenten zu untersuchen, betreibt das Fraunhofer-Institut für Solare Energiesysteme ISE Außenprüfstände in vier verschiedenen Klimaten.

Für die kosteneffiziente Fertigung von Solarzellen ist es wichtig, Zellen mit hohen Wirkungsgraden bei hoher Prozessstabilität und mit geringer Streuung zu produzieren.Entscheidend hierfür ist nicht nur die Güte der Fertigungsprozesse, sondern auch die elektrische und mechanische Qualität der verwendeten Wafer. Besonders die Materialqualität multikristalliner Wafer kann stark schwanken. Wafer unzureichender Qualität sollten frühzeitig erkannt und aussortiert werden, um unnötige Kosten zu vermeiden.

Fraunhofer ISE offers a comprehensive range of services for product development and material qualification in the field of module technology. With many years of experience, excellently trained staff and well-equipped laboratories, we turn innovative ideas into new approaches for reliable, efficient and competitive PV modules. We assist our clients in improving the quality and efficiency of existing module and interconnection concepts. At all times we make use of the vast research network available along the entire PV value chain at Fraunhofer ISE.

Colored PV modules strongly support the acceptance and attractivity of building integrated PV (BIPV). Especially architects and building planners desire an individual color choice, saturated colors, a homogeneous appearance for all possible viewing angles and at the same time a high module efficiency. The demand grows rapidly – builders from around the world increasingly ask for self-sufficiency of their buildings.

Photovoltaics have become an important pillar in the global energy supply. Recently, the application of PV technology has especially gained importance in countries with challenging climates, e.g. in the Middle East and North Africa. Due to the constant cost pressure on PV module production, standardized quality assurance remains crucial to ensure safe and reliable products.

Die bedarfsgerechte Netzeinspeisung von Photovoltaik(PV)-Kraftwerken wird zukünftig von zentraler Bedeutung sein, insbesondere in der Direktvermarktung von Solarstrom. Neben präzisen Prognosemodellen werden dabei Batteriespeicher eine wesentliche Rolle spielen, um Solarstrom planbar und verlässlich am Energiemarkt anbieten sowie kurzzeitige Fluktuationen kompensieren zu können.

In our accredited calibration laboratory CalLab PV Modules, we combine comprehensive scientific know-how with modern measurement technology. Among our  clients are renowned module manufacturers, EPCs (engineering, procurement, construction) and investors with the highest demands on quality. Many years of experience and our excellent reputation in the field of PV module calibration and performance testing ensure reliable measurement results.

The initial phases of a photovoltaic power plant project are very important for its success. We offer professional quality assurance services for project development and engineering.

Organic Photovoltaics (OPV) is an emerging technology that employs organic semiconductors such as polymers and oligomers to convert light into electrical energy. Due to the extremely low material consumption, no heavy metal use and low temperature processing, the environmental impact of this technology is exceptionally low and energy payback times are only a few months. Further advantages are low weight and ultimate flexibility. All materials can be coated and printed with high throughput production methods at low costs allowing solar cells designed in nearly arbitrary shapes. Moreover the absorption spectrum can be tailored so that different colors can be realized; even neutrally tinted semitransparent windows are possible.

Crystalline silicon thin-film (c-SiTF) solar cells present a promising concept to combine the advantages of conventional wafer-based silicon solar cells with those of thin-film solar cells: high and stable efficiencies and low production costs. In our approach, the electrically active base of the solar cell with a thickness of a few tens of micrometers is grown upon a substrate material, which gives the necessary mechanical stability.

Fraunhofer ISE has long time experience in developing highest performance solar cells made from III-V compound semiconductors. We use materials made from the 3rd and 5th column  of the periodic table such as GaAs or GaInP to develop multi-junction devices. Our solar cells reach record efficiencies up to 46.0 % under sunlight concentrated 508 times. We offer  industry and research partners comprehensive services to enhance their products.

In order to fabricate solar cells cost effectively, it is important to produce highefficiency cells with the utmost process stability and minimum process variation. Not only the fabrication process is key here, the electrical and mechanical excellence of the wafers used is equally important. The quality of multicrystalline wafer materials is particularly susceptible to variation. Poor quality wafers should be identified and discarded at an early stage in the process to avoid unnecessary costs.

In the past few years, Potential Induced Degradation (PID) has been recognized as a failure mechanism that can cause substantial power loss in different PV module types and decrease the power plant performance ratio. In some cases, corrosive PID also becomes visible in module appearance.

The precise measurement of solar cells and modules is of crucial importance in solar technology. As one of the world’s leading laboratories, CalLab PV Cells, the photovoltaic calibration laboratory at Fraunhofer ISE, provides comprehensive measurement services in this field since 30 years.

Aiming at steadily reducing the levelized cost of electricity of PV plants, state-ofthe- art research and development in silicon photovoltaics must focus on material quality: This relates to feedstock quality, to the impact of the crystallization and wafering processes, and to the impact of the individual solar cell process on material quality. Such focus on material quality calls for accurate analysis techniques of efficiency-limiting electrical characteristics in all stages of solar cell production – ranging from crystallization to metalization.

Device-integrated photovoltaics are an effective solution for small and grid-independent applications. Power generating solar cells provide a reliable, cost effective and flexible source of electrical energy for a wide range of consumers.

PV power plants have become a competitive option for electricity generation in many regions with high solar irradiation levels like the sun belt region. For reliable operation in challenging climates with elevated UV doses, PV modules have to be engineered and qualified carefully. UV irradiation is well known to be a crucial degradation factor, strongly depending on the radiation spectrum.

The integration of battery storage in photovoltaic (PV) systems or PV diesel mini-grids enables high solar fractions and is often more cost-effective than conventional power supplies relying upon fossil fuels.

Demand-based feed-in of electricity from grid connected photovoltaic (PV) power plants will be of central importance in the future, in particular for the direct marketing of solar power.
In addition to accurate prediction models, battery storage systems will play an essential role in offering solar power in a predictable and reliable way on the energy market as well as in compensating short-term fluctuations.

Over the last two decades Fraunhofer ISE has made important contributions to the quality assurance of PV and solar thermal power plants. We offer quality assessments for every stage of PV or solar thermal power plant projects – from planning and design up to long-term operation.

High temperature processes form a vital part of solar cell fabrication. Examples of such processes are forming the pn-junction by diffusion, firing screen printed contacts, activating surface passivation layers or annealing process induced defects. In order to take full advantage of new materials, continuous optimization of high temperature processes is indispensable.

Solar cell metallization is a crucial point of optimization for silicon solar cells both technologically and from a cost point of view. The introduction of optimized emitters with low surface doping concentrations enables solar cell efficiency improvements in advanced silicon solar cell concepts. Silver material for metallization may become critical in the future with respect to high material costs, cost fluctuations and large scale availability.

The climatic conditions affecting solar systems vary considerably from location to location, resulting in different requirements for materials and components of PV modules and thermal collectors. Fraunhofer ISE operates outdoor test sites in four different climates in order to assess the effects of different weathering conditions on the reliability of PV modules and thermal collectors.

Based on many years of experience in characterization and evaluation of CPV modules, the Fraunhofer Institute for Solar Energy Systems ISE offers support in the development, investigation and analysis of CPV module / system design and performance. We follow a compre-hensive and holistic approach in order to provide the best benefit for our customers.

Demand-based feed-in of electricity from grid connected photovoltaic (PV) power plants will be of central importance in the future, in particular for the direct marketing of solar power. In addition to accurate prediction models, battery storage systems will play an essential role in offering solar power in a predictable and reliable way on the energy market as well as in compensating short-term fluctuations. Based on its long-term experience, Fraunhofer ISE offers a wide range of services for planners, developers and investors in the areas of quality assurance for PV power plants, battery system technology and integration of battery storage in PV systems as well as in the field of simulation of energy systems.

Based on many years of experience in prototyping and testing, Fraunhofer ISE supports providers of concentrator PV modules and systems in the development, investigation and analysis of system design and performance. We follow a comprehensive approach, always keeping the economical application in mind. Our main R&D efforts in High Concentration Modules and Systems are combined in the Concentrator Technologies & Evaluation Center (ConTEC).

Solar cell manufacturers are challenged to continuously investigate efficiency limitations of their products in order to detect optimization opportunities. Fraunhofer ISE offers a customized Complete Solar Cell Loss Analysis package including experimental results as well as detailed expert reports.

N-type solar cells offer the highest conversion efficiencies due to the absence of light induced degradation and the lower sensitivity to common impurities like iron. At the Fraunhofer Institute for Solar Energy Systems ISE we develop process sequences for n-type cells that considerably reduce the number of process steps. A key technology is the simultaneous diffusion of p and n dopants by co-diffusion.

Manufacturers of silicon wafers and cells are challenged to deploy indepth material analysis in order to optimize material performance and increase the efficiency and quality of their products. Fraunhofer ISE provides customized Efficiency Analysis packages including experimental results as well as detailed expert reports based on our unique methodology.

In order to further increase the quality of their products, manufacturers of silicon wafers and cells are challenged to perform detailed analysis of the impurity distribution in their materials. Fraunhofer ISE provides customized Impurity Distribution Analysis services encompassing experimental results as well as detailed expert reports based on our unique methodology.

Fraunhofer ISE has been working on crystalline silicon thin-film solar cells for many years. Our speciality lies in silicon and silicon-based deposition on a variety of silicon and non-silicon  substrates, the recrystallization of silicon layers and in adapting solar cell production processes. We are experts in handling a wide range of contamination levels, variable substrate sizes and morphologies and temperatures up to 1500 °C.

Photovoltaic cells can convert monochromatic light into electricity much more efficiently than the spectrum of the solar radiation. By tuning the photovoltaic cell’s semiconductor bandgap to the specific wavelength of the light, thermalization and transmission losses are minimized. In this way, high conversion efficiencies of light into electricity over 50% have been realized.

Substitute for Silver on Solar Cells: Despite recently achieved reductions in consumption, screen printed silver used in solar cell front side metallization is still an important cost driver in solar cell production. Furthermore, the conductivity of printed and fired metallization is limited due to glass compounds and porous structure.

Micro- and nanostructured surfaces can fulfill a variety of different functions. An important application field is photon management in optical systems. The Fraunhofer Institute for Solar Energy Systems ISE advances the fundamental understanding of the optics of microstructured components, modeling, design, production as well as replication and characterization of large-area micro- and nanostructures.

Methods for the fabrication of high-quality silicon surface passivation layers have received much attention recently. One approach that makes use of these layers is the Passivated Emitter and Rear Cell (PERC). Compared to conventional solar cells with a full area aluminium alloyed rear contact, the combination of surface passivation layers and local rear contacts results in an improved light trapping and a reduced surface recombination, leading to higher conversion efficiencies.

Metal wrap through (MWT) solar cells provide higher conversion efficiencies under processes close to standard fabrication sequences. Therefore this concept exhibits an excellent perspective for large-scale PV market penetration. In more than 8 years of research and development in the field of MWT technology, a profound expertise has been acquired at Fraunhofer ISE.

Crystalline silicon based tandem solar cells are a promising way to circumvent the conversion efficiency limits of conventional single-junction photovoltaic cells. In such devices, the visible wavelength range of the solar spectrum is converted more efficiently by adding additional pn-junctions on top of a Si cell.

The highest conversion efficiencies of sunlight into electricity are obtained for multi-junction solar cells made of so-called III-V compound semiconductors. This class of materials combines  elements from the 3rd and 5th column of the periodic table like Al, Ga, In, As, P, N or Sb in a single crystal.

We offer calibrated measurements of III-V multi-junction cells for space and terrestrial concentrator applications as well as of single-junction concentrator solar cells.

Equipped with an excellent infrastructure and long-standing expertise, Fraunhofer ISE offers a variety of services for challenging functional printing applications like silicon solar cells, printed circuit boards (PCBs), fuel cells, batteries, sensors, electronic devices and more. We support material, equipment as well as device manufacturers in selecting suitable printing technologies, developing functional materials or innovative processes. We offer a wide range of characterization methods covering all relevant aspects from material and surface characterization to an in-depth analysis of electrical, optical and functional properties.

External quantum efficiency (EQE) measurements find widespread application for solar cell characterization. They yield depth dependent information on cell properties and quality and they enable single cell characterization in multi junction devices.

The FLATCON® module technology has been designed to meet the world’s highest conversion efficiencies from sunlight to electricity while being manufacturablein large volumes.

Fraunhofer ISE CalLab PV Cells, one of the world’s leading calibration laboratories, provides industry and research facilities with comprehensive measurement services for a wide range of solar cells.

The technological work is accompanied by comprehensive analysis and qualification of silicon materials and solar cells which enable efficiency-limiting mechanisms to be
identified and material, processes and cell concepts to be systematically improved. Using a large variety of state-ofthe-art offline and inline metrology systems, we are able to measure all relevant quality parameters on starting wafers, solar cell precursors and finished solar cells on a statistically relevant basis. Metrology systems with high spatial resolution allow loss mechanisms of cells to be analyzed in depth. A well-equipped wet-chemistry analysis laboratory allows inlinemonitoring of chemical baths.

Für die kosteneffiziente Fertigung von Solarzellen ist es wichtig, Zellen mit hohen Wirkungsgraden bei hoher Prozessstabilität und mit geringer Streuung zu produzieren.Entscheidend hierfür ist nicht nur die Güte der Fertigungsprozesse, sondern auch die elektrische und mechanische Qualität der verwendeten Wafer. Besonders die Materialqualität multikristalliner Wafer kann stark schwanken. Wafer unzureichender Qualität sollten frühzeitig erkannt und aussortiert werden, um unnötige Kosten zu vermeiden.

Crystalline silicon thin-film (c-SiTF) solar cells present a promising concept to combine the advantages of conventional wafer-based silicon solar cells with those of thin-film solar cells: high and stable efficiencies and low production costs. In our approach, the electrically active base of the solar cell with a thickness of a few tens of micrometers is grown upon a substrate material, which gives the necessary mechanical stability.

The precise measurement of solar cells and modules is of crucial importance in solar technology. As one of the world’s leading laboratories, CalLab PV Cells, the photovoltaic calibration laboratory at Fraunhofer ISE, provides comprehensive measurement services in this field since 30 years.

Aiming at steadily reducing the levelized cost of electricity of PV plants, state-ofthe- art research and development in silicon photovoltaics must focus on material quality: This relates to feedstock quality, to the impact of the crystallization and wafering processes, and to the impact of the individual solar cell process on material quality. Such focus on material quality calls for accurate analysis techniques of efficiency-limiting electrical characteristics in all stages of solar cell production – ranging from crystallization to metalization.

High temperature processes form a vital part of solar cell fabrication. Examples of such processes are forming the pn-junction by diffusion, firing screen printed contacts, activating surface passivation layers or annealing process induced defects. In order to take full advantage of new materials, continuous optimization of high temperature processes is indispensable.

Solar cell metallization is a crucial point of optimization for silicon solar cells both technologically and from a cost point of view. The introduction of optimized emitters with low surface doping concentrations enables solar cell efficiency improvements in advanced silicon solar cell concepts. Silver material for metallization may become critical in the future with respect to high material costs, cost fluctuations and large scale availability.

Solar cell manufacturers are challenged to continuously investigate efficiency limitations of their products in order to detect optimization opportunities. Fraunhofer ISE offers a customized Complete Solar Cell Loss Analysis package including experimental results as well as detailed expert reports.

Manufacturers of silicon wafers and cells are challenged to deploy indepth material analysis in order to optimize material performance and increase the efficiency and quality of their products. Fraunhofer ISE provides customized Efficiency Analysis packages including experimental results as well as detailed expert reports based on our unique methodology.

In order to further increase the quality of their products, manufacturers of silicon wafers and cells are challenged to perform detailed analysis of the impurity distribution in their materials. Fraunhofer ISE provides customized Impurity Distribution Analysis services encompassing experimental results as well as detailed expert reports based on our unique methodology.

N-type solar cells offer the highest conversion efficiencies due to the absence of light induced degradation and the lower sensitivity to common impurities like iron. At the Fraunhofer Institute for Solar Energy Systems ISE we develop process sequences for n-type cells that considerably reduce the number of process steps. A key technology is the simultaneous diffusion of p and n dopants by co-diffusion.

Fraunhofer ISE has been working on crystalline silicon thin-film solar cells for many years. Our speciality lies in silicon and silicon-based deposition on a variety of silicon and non-silicon  substrates, the recrystallization of silicon layers and in adapting solar cell production processes. We are experts in handling a wide range of contamination levels, variable substrate sizes and morphologies and temperatures up to 1500 °C.

Substitute for Silver on Solar Cells: Despite recently achieved reductions in consumption, screen printed silver used in solar cell front side metallization is still an important cost driver in solar cell production. Furthermore, the conductivity of printed and fired metallization is limited due to glass compounds and porous structure.

Micro- and nanostructured surfaces can fulfill a variety of different functions. An important application field is photon management in optical systems. The Fraunhofer Institute for Solar Energy Systems ISE advances the fundamental understanding of the optics of microstructured components, modeling, design, production as well as replication and characterization of large-area micro- and nanostructures.

Methods for the fabrication of high-quality silicon surface passivation layers have received much attention recently. One approach that makes use of these layers is the Passivated Emitter and Rear Cell (PERC). Compared to conventional solar cells with a full area aluminium alloyed rear contact, the combination of surface passivation layers and local rear contacts results in an improved light trapping and a reduced surface recombination, leading to higher conversion efficiencies.

High temperature processes form a vital part of solar cell fabrication. Examples of such processes are forming the pn-junction by diffusion, firing screen printed contacts, activating surface passivation layers or annealing process induced defects. In order to take full advantage of new materials, continuous optimization of high temperature processes is indispensable.

Low concentrating photovoltaic (LCPV) systems utilizing industrial “one-sun” manufacturing equipment is an interesting path for producing low cost electricity from solar
energy. Fraunhofer ISE has extensive experience in solar cell technology, concentrating technologies and system development. We partner with industry to achieve the highest performance on the component as well as on the system level.

Fraunhofer ISE has long time experience in developing highest performance solar cells made from III-V compound semiconductors. We use materials made from the 3rd and 5th column  of the periodic table such as GaAs or GaInP to develop multi-junction devices. Our solar cells reach record efficiencies up to 46.0 % under sunlight concentrated 508 times. We offer  industry and research partners comprehensive services to enhance their products.

Based on many years of experience in characterization and evaluation of CPV modules, the Fraunhofer Institute for Solar Energy Systems ISE offers support in the development, investigation and analysis of CPV module / system design and performance. We follow a compre-hensive and holistic approach in order to provide the best benefit for our customers.

Based on many years of experience in prototyping and testing, Fraunhofer ISE supports providers of concentrator PV modules and systems in the development, investigation and analysis of system design and performance. We follow a comprehensive approach, always keeping the economical application in mind. Our main R&D efforts in High Concentration Modules and Systems are combined in the Concentrator Technologies & Evaluation Center (ConTEC).

Photovoltaic cells can convert monochromatic light into electricity much more efficiently than the spectrum of the solar radiation. By tuning the photovoltaic cell’s semiconductor bandgap to the specific wavelength of the light, thermalization and transmission losses are minimized. In this way, high conversion efficiencies of light into electricity over 50% have been realized.

The highest conversion efficiencies of sunlight into electricity are obtained for multi-junction solar cells made of so-called III-V compound semiconductors. This class of materials combines  elements from the 3rd and 5th column of the periodic table like Al, Ga, In, As, P, N or Sb in a single crystal.

We offer calibrated measurements of III-V multi-junction cells for space and terrestrial concentrator applications as well as of single-junction concentrator solar cells.

Organic Photovoltaics (OPV) is an emerging technology that employs organic semiconductors such as polymers and oligomers to convert light into electrical energy. Due to the extremely low material consumption, no heavy metal use and low temperature processing, the environmental impact of this technology is exceptionally low and energy payback times are only a few months. Further advantages are low weight and ultimate flexibility. All materials can be coated and printed with high throughput production methods at low costs allowing solar cells designed in nearly arbitrary shapes. Moreover the absorption spectrum can be tailored so that different colors can be realized; even neutrally tinted semitransparent windows are possible.

Micro- and nanostructured surfaces can fulfill a variety of different functions. An important application field is photon management in optical systems. The Fraunhofer Institute for Solar Energy Systems ISE advances the fundamental understanding of the optics of microstructured components, modeling, design, production as well as replication and characterization of large-area micro- and nanostructures.

Crystalline silicon based tandem solar cells are a promising way to circumvent the conversion efficiency limits of conventional single-junction photovoltaic cells. In such devices, the visible wavelength range of the solar spectrum is converted more efficiently by adding additional pn-junctions on top of a Si cell.

Die von der Bundesregierung beschlossene Energiewende sieht eine Erhöhung des Stromanteils aus erneuerbaren Energien (EE) auf 65% bis zum Jahr 2030 und auf mindestens 80% bis zum Jahr 2050 vor. Fast alle Energiesystemszenarien zeigen, dass die Photovoltaik (PV) neben der Windkraft die wichtigste Säule der zukünftigen Energieversorgung in Deutschland und weltweit sein wird. Nötig für eine erfolgreiche Energiewende in Deutschland sind nach Berechnungen des Fraunhofer ISE – je nach weiteren Randbedingungen – bis zu 500 Gigawatt installierte PV-Leistung.

Die Integration von Photovoltaik (PV)-Technologien in bereits genutzte oder bebaute Flächen unserer Umwelt erschließt ein riesiges Potenzial für die Stromerzeugung aus erneuerbaren Energien. Die Anwendungsbereiche sind vielfältig: Integrierte PV fügt sich nahezu unsichtbar in Gebäude- und Fahrzeughüllen ein, aber auch in Verkehrswegen, als schwimmende PV auf künstlichen Seen, als aufgeständerte Module auf Agrarflächen oder auf öffentlichen Plätzen im urbanen Raum eröffnet sie neue Möglichkeiten.

Integrating photovoltaic (PV) technologies into buildings, built-up surfaces or on areas already being used for another purpose unlocks a huge potential for renewable electricity generation. The areas of application are many and varied: Integrated PV fits almost invisibly into building envelopes and vehicle bodies, but also opens up new possibilities along roadways and railways, or as floating PV on flooded open-cast mines, as modules elevated above agricultural land or in urban areas as cover structures in public places.

Die Energiewende erfordert einen massiven Ausbau der Solarstromproduktion, verbunden mit einem hohen Flächenbedarf. Das Problem für Freiflächenanlagen: Ackerland ist eine sehr begrenzte und wertvolle Ressource. Die Agri-Photovoltaik (Agri-PV) löst diesen Konflikt, indem sie Lebensmittelproduktion und Stromproduktion auf derselben Fläche ermöglicht.

The energy transformation requires a massive expansion of solar electricity production, combined with a high demand for space. The problem for ground-mounted systems: Arable land is a very limited and valuable resource. Agrivoltaics solves this conflict by enabling food production and electricity generation on the same area.

Gebäude haben bundesweit einen hohen Anteil am Gesamtenergiebedarf und an den Treibhausgasemissionen. Die bauwerkintegrierte PV (BIPV) kann die CO2-Bilanz eines Gebäudes wesentlich verbessern, idealerweise bis zum Nullenergie- oder Plusenergiegebäude.

Nach aktuellen Schätzungen werden in Deutschland ab 2028 über 70% aller neu zugelassenen Fahrzeuge elektrisch angetrieben, ein Teil davon als Hybrid-Fahrzeuge. Integrierte Solarzellen können
die Reichweiten von Elektrofahrzeugen spürbar erhöhen.

According to current estimates, more than 70% of all newly registered vehicles in Germany will be electrically powered from year 2028, part of them as hybrid vehicles. Integrated solar cells can noticeably increase the range of electric vehicles.

Fraunhofer ISE offers a wide range of services for product development and material qualification in the field of module technology. With many years of experience, excellently trained scientific staff and advanced research laboratories – including industrial production equipment – we transform innovative ideas into reliable, efficient and competitive solutions. Together with our customers we develop new applications with integrated photovoltaics generating solar electricity from buildings, vehicles and roads.

Reference cells produced by Fraunhofer ISE are cutting-edge equipment for manufacturers of PV modules, laboratories and EPC contractors (Engineering, Procurement and Construction) worldwide.

In shingle modules, rectangular cells are connected by edge overlap, an arrangement similar to roof tiles. The power output of shingle modules is increased by significantly enhancing the active cell area ratio within the module, decreasing shading losses, reducing cell interconnection losses.

High performing PV power plants are key to your return on investment. We offer monitoring services, which include immediate reporting of deviations from the expected performance.

The integration of solar cells into photovoltaic modules results in gains and losses that change the power and efficiency of the module in comparison to the initial solar cells. With SmartCalc.CTM Fraunhofer ISE provides a professional software solution to optimize solar modules and to analyze cellto- module (CTM) gain and loss factors.

The share of photovoltaics in global energy supply is increasing rapidly. The dynamic PV module market is driven by high cost pressure and short innovation cycles. A large number of cell manufacturers and material suppliers for backsheets, encapsulants and others offer increasingly efficient and competetive products. The assurance of module quality is becoming outstandingly important for investors and manufacturers.

Along with the massive cost reduction for solar cells, building integration of PV (BIPV) is becoming more and more attractive. On the other hand, solar electricity production on building skins is increasingly required in public tenders.

Electrically conductive adhesives (ECA) have become an important alternative to solder joints for the interconnection of heterojunction solar cells (HJT) as well as for shingle interconnection in industrial production.

The generation of PV electricity depends on the sun’s position and the weather. In energy meteorology, Fraunhofer ISE develops algorithms to predict PV power for forecast horizons from a few minutes to several days. In order to support a reliable and costeffective power supply, PV power prediction is becoming increasingly important for solar energy trading, management of grid stability, reduction of grid integration cost for PV power.

Bifacial photovoltaic (PV) modules are able to utilize light from both sides and can therefore signifi cantly increase the electric yield of PV power plants. The yield gain compared to monofacial modules is mainly determined by the conversion efficiency for solar irradiance incident on the rear side of a bifacial PV module, and the amount and quality of solar irradiance incident on the rear side.

The professional quality assurance services of Fraunhofer ISE have been contributing to high performance and optimal yields of PV power plants for more than 30 years. Real world experience highlights the importance of system design, proper planning, engineering, component selection and construction work for successful PV systems. Thus, comprehensive quality assurance for PV power plants covers all phases of the completion process from the planning to system operation and maintenance.

Multiple factors affect the reliability and long-term performance of photovoltaic modules. The quality and characteristics of the used materials, the interaction of the components, the manufacturing process and, of course, the local climate at the operating site play a significant role. 

At Fraunhofer ISE we use high-resolution analytical methods to assess degradation indicators and mechanisms. These methods serve as powerful tools that  complement the current-voltage (IV) measurements.

Die klimatischen Einflüsse, die auf Solaranlagen einwirken, sind je nach Standort sehr verschieden. Dadurch ergeben sich unterschiedliche Anforderungen für Materialien und Komponenten von PV-Modulen und thermischen Kollektoren. Um die Auswirkungen der unterschiedlichen Witterungseinflüsse auf die Beständigkeit von Solarkomponenten zu untersuchen, betreibt das Fraunhofer-Institut für Solare Energiesysteme ISE Außenprüfstände in vier verschiedenen Klimaten.

Fraunhofer ISE offers a comprehensive range of services for product development and material qualification in the field of module technology. With many years of experience, excellently trained staff and well-equipped laboratories, we turn innovative ideas into new approaches for reliable, efficient and competitive PV modules. We assist our clients in improving the quality and efficiency of existing module and interconnection concepts. At all times we make use of the vast research network available along the entire PV value chain at Fraunhofer ISE.

Colored PV modules strongly support the acceptance and attractivity of building integrated PV (BIPV). Especially architects and building planners desire an individual color choice, saturated colors, a homogeneous appearance for all possible viewing angles and at the same time a high module efficiency. The demand grows rapidly – builders from around the world increasingly ask for self-sufficiency of their buildings.

Photovoltaics have become an important pillar in the global energy supply. Recently, the application of PV technology has especially gained importance in countries with challenging climates, e.g. in the Middle East and North Africa. Due to the constant cost pressure on PV module production, standardized quality assurance remains crucial to ensure safe and reliable products.

Die bedarfsgerechte Netzeinspeisung von Photovoltaik(PV)-Kraftwerken wird zukünftig von zentraler Bedeutung sein, insbesondere in der Direktvermarktung von Solarstrom. Neben präzisen Prognosemodellen werden dabei Batteriespeicher eine wesentliche Rolle spielen, um Solarstrom planbar und verlässlich am Energiemarkt anbieten sowie kurzzeitige Fluktuationen kompensieren zu können.

In our accredited calibration laboratory CalLab PV Modules, we combine comprehensive scientific know-how with modern measurement technology. Among our  clients are renowned module manufacturers, EPCs (engineering, procurement, construction) and investors with the highest demands on quality. Many years of experience and our excellent reputation in the field of PV module calibration and performance testing ensure reliable measurement results.

The initial phases of a photovoltaic power plant project are very important for its success. We offer professional quality assurance services for project development and engineering.

In the past few years, Potential Induced Degradation (PID) has been recognized as a failure mechanism that can cause substantial power loss in different PV module types and decrease the power plant performance ratio. In some cases, corrosive PID also becomes visible in module appearance.

Device-integrated photovoltaics are an effective solution for small and grid-independent applications. Power generating solar cells provide a reliable, cost effective and flexible source of electrical energy for a wide range of consumers.

The integration of battery storage in photovoltaic (PV) systems or PV diesel mini-grids enables high solar fractions and is often more cost-effective than conventional power supplies relying upon fossil fuels.

PV power plants have become a competitive option for electricity generation in many regions with high solar irradiation levels like the sun belt region. For reliable operation in challenging climates with elevated UV doses, PV modules have to be engineered and qualified carefully. UV irradiation is well known to be a crucial degradation factor, strongly depending on the radiation spectrum.

Over the last two decades Fraunhofer ISE has made important contributions to the quality assurance of PV and solar thermal power plants. We offer quality assessments for every stage of PV or solar thermal power plant projects – from planning and design up to long-term operation.

Metal wrap through (MWT) solar cells provide higher conversion efficiencies under processes close to standard fabrication sequences. Therefore this concept exhibits an excellent perspective for large-scale PV market penetration. In more than 8 years of research and development in the field of MWT technology, a profound expertise has been acquired at Fraunhofer ISE.