Fraunhofer Institute for Solar Energy Systems ISE
Fraunhofer Institute for Solar Energy Systems ISE

Dr. Henning Helmers

Deputy Head of Department »II-V Photovoltaics and Concentrator Technology«, Division Photovoltaics

Short biography

Dr. Henning Helmers has a profound experience in photovoltaics, with a focus on III-V based multi-junction solar cells, concentrating solar systems, high efficiency laser power converters, and optical power transmission. He joined the Fraunhofer Institute for Solar Energy Systems ISE in Freiburg in 2008. Since 2013 he is coordinating the business area »Power-by-Light« Since 2019 he is Deputy Head of Department »III-V Photovoltaics and Concentrator Technology«. His current research interests include high efficiency PV cell design, advanced PV cell architectures with elevated voltage, III-V absorber materials tailored for laser light conversion, power by light system development, thin-film processing, back mirrors and photonic structures, photon recycling and luminescence coupling.

Dr. Helmers studied physics and philosophy in Oldenburg and in Lund, Sweden. He holds a doctoral degree in physics from University of Oldenburg (2013, summa cum laude: highest distinction); for his PhD he held a scholarship of the German Federal Environmental Foundation (DBU). He authored and coauthored more than 50 scientific papers and filed 5 patents.

Publications

Publication list from the Fraunhofer-Publica database:

Jahr
Year		Titel/Autor:in
Title/Author		Publikationstyp
Publication Type
2021 Pushing the Boundaries of Photovoltaic Light to Electricity Conversion: A GaAs Based Photonic Power Converter with 68.9% Efficiency
Helmers, H.; Lopez, E.; Höhn, O.; Lackner, D.; Schön, J.; Schauerte, M.; Schachtner, M.; Dimroth, F.; Bett, A.W.		 Konferenzbeitrag
Conference Paper
2021 68.9% Efficient GaAs-Based Photonic Power Conversion Enabled by Photon Recycling and Optical Resonance. Cover Picture
Helmers, H.; Lopez, E.; Höhn, O.; Lackner, D.; Schön, J.; Schauerte, M.; Schachtner, M.; Dimroth, F.; Bett, A.W.		 Zeitschriftenaufsatz
Journal Article
2021 Technical Boundaries of Micro-CPV Module Components: How Small is Enough
Wiesenfarth, M.; Martínez, J.F.; Steiner, M.; Iankov, D.; Nitz, P.; Dimroth, F.; Helmers, H.		 Vortrag
Presentation
2021 4-Junction GaAs Based Thin Film Photonic Power Converter with Back Surface Reflector for Medical Applications
Schauerte, M.; Höhn, O.; Wierzkowski, T.; Keller, G.; Helmers, H.		 Konferenzbeitrag
Conference Paper
2021 Free Space Optical Link for Simultaneous Power and 1 Gb/s Data Transmission
Fakidis, J.; Helmers, H.; Haas, H.		 Konferenzbeitrag
Conference Paper
2021 Current Mismatch and Luminescence Coupling in Three-junction Photonic Power Converters with and without Back Reflector
Lopez, E.; Höhn, O.; Schauerte, M.; Lackner, D.; Schachtner, M.; Reichmuth, S.K.; Helmers, H.		 Konferenzbeitrag
Conference Paper
2021 Technical Boundaries of Micro-CPV Module Components: How Small is Enough?
Wiesenfarth, M.; Iankov, D.; Martínez, J.F.; Nitz, P.; Steiner, M.; Dimroth, F.; Helmers, H.		 Vortrag
Presentation
2021 Voltage losses due to the perimeter and dark area in micro-concentrator solar cells
Wiesenfarth, M.; Steiner, M.; Helmers, H.; Bett, A.W.		 Zeitschriftenaufsatz
Journal Article
2021 Non-Uniform Illumination Impacts on O-Band InGaAsP and Metamorphic GaInAs Photonic Power Converters
Beattie, M.; Helmers, H.; Valdivia, C.E.; Lackner, D.; Höhn, O.; Hinzer, K.		 Konferenzbeitrag
Conference Paper
2021 Thin film GaAs solar cell enabled by direct rear side plating and patterned epitaxial lift-off
Wulf, J.; Oliva, E.; Mikolasch, G.; Bartsch, J.; Dimroth, F.; Helmers, H.		 Konferenzbeitrag
Conference Paper
2021 High Efficiency III-V Based Photovoltaic Cells for Laser Power Beaming and Solar Power Generation in Space
Helmers, H.		 Vortrag
Presentation
2021 68.9% Efficient GaAs-Based Photonic Power Conversion Enabled by Photon Recycling and Optical Resonance
Helmers, H.; Lopez, E.; Höhn, O.; Lackner, D.; Schön, J.; Schauerte, M.; Schachtner, M.; Dimroth, F.; Bett, A.W.		 Zeitschriftenaufsatz
Journal Article
2021 Experimental Coupling Process Efficiency and Benefits of Back Surface Reflectors in Photovoltaic Multi-junction Photonic Power Converters
Lopez, E.; Höhn, O.; Schauerte, M.; Lackner, D.; Schachtner, M.; Reichmuth, K.; Helmers, H.		 Zeitschriftenaufsatz
Journal Article
2021 Integrated series/parallel connection for photovoltaic laser power converters with optimized current matching
Wagner, L.; Reichmuth, S.K.; Philipps, S.P.; Oliva, E.; Bett, A.W.; Helmers, H.		 Zeitschriftenaufsatz
Journal Article
2021 New Frontiers in III-V based Photonic Power Converters
Helmers, H.		 Konferenzbeitrag
Conference Paper
2020 51% Efficient Photonic Power Converters for O-Band Wavelengths around 1310 nm
Helmers, H.; Franke, A.; Lackner, D.; Höhn, O.; Predan, F.; Dimroth, F.		 Konferenzbeitrag
Conference Paper
2020 Wafer-bonded GaInP/GaAs/GaInAs//GaSb four-junction solar cells with 43.8% efficiency under concentration
Predan, F.; Franke, A.; Hoehn, O.; Lackner, D.; Helmers, H.; Siefer, G.; Bett, A.W.; Dimroth, F.		 Konferenzbeitrag
Conference Paper
2020 Simultaneous Wireless Data and Power Transfer for a 1-Gb/s GaAs VCSEL and Photovoltaic Link
Fakidis, J.; Helmers, H.; Haas, H.		 Zeitschriftenaufsatz
Journal Article
2020 6-W Optical Power Link with Integrated Optical Data Transmission
Helmers, H.; Armbruster, C.; Ravenstein, Moritz von; Derix, D.; Schöner, C.		 Zeitschriftenaufsatz
Journal Article
2020 Development and analysis of wafer-bonded four-junction solar cells based on antimonides with 42% efficiency under concentration
Predan, F.; Höhn, O.; Lackner, D.; Franke, A.; Helmers, H.; Dimroth, F.		 Zeitschriftenaufsatz
Journal Article
2020 Power-by-Light or How to Reach an Efficiency of 68%?
Helmers, H.		 Vortrag
Presentation
2019 Highly Efficient III-V Based Photovoltaic Laser Power Converters
Helmers, H.; Höhn, O.; Lackner, D.; Lopez, E.; Ruiz-Preciado, L.; Schauerte, M.; Siefer, G.; Dimroth, F.; Bett, A.W.		 Vortrag
Presentation
2019 GaAs Multi-Junction Laser Power Converters at AZUR SPACE. Current Status and Development Activities
Keller, G.; Fuhrmann, D.; Wierzowski, T.; Volk, A.-K.; Fuhrmann, B.; Horst, L.; Wächter, C.; Schauerte, M.; Helmers, H.; Khorenko, V.		 Vortrag
Presentation
2019 5 W Optical Power Link with Generic Voltage Output and Modulated Data Signal
Haid, M.; Armbruster, C.; Derix, D.; Schöner, C.; Helmers, H.		 Vortrag
Presentation
2019 Comprehensive Electrical Loss Analysis of Monolithic Interconnected Multi-Segment Laser Power Converters
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		 Zeitschriftenaufsatz
Journal Article
2018 Power-by-Light - Optical Power Transmission Based on Photovoltaic Laser Power Converters
Helmers, H.		 Vortrag
Presentation
2018 Luminescent Coupling in Multi-Junction Photovoltaic Devices Studied by Transient Voltage Measurements
Tayagaki, T.; Reichmuth, S.K.; Helmers, H.; Siefer, G.		 Vortrag
Presentation
2018 Transient Analysis of Luminescent Coupling Effects in Multi-junction Solar Cells
Tayagaki, T.; Reichmuth, S.K.; Helmers, H.; Siefer, G.		 Zeitschriftenaufsatz
Journal Article
2018 Optische Leistungsversorgung für Sensorsysteme mittels photovoltaischer Laserleistungszellen
Helmers, H.		 Vortrag
Presentation
2018 On the influence of the photo-induced leakage current in monolithically interconnected modules
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		 Zeitschriftenaufsatz
Journal Article
2018 Photovoltaisches Halbleiterbauelement zur Konversion von Strahlungsleistung in elektrische Leistung, Verfahren zu dessen Herstellung und dessen Verwendung
Helmers, Henning; Höhn, Oliver; Walker, Alexandre Wiliam		 Patent
2018 Power loss mechanisms in small area monolithic-interconnected photovoltaic modules
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		 Zeitschriftenaufsatz
Journal Article
2018 0.5-Gb/s OFDM-Based Laser Data and Power Transfer Using a GaAs Photovoltaic Cell
Fakidis, J.; Videv, S.; Helmers, H.; Haas, H.		 Zeitschriftenaufsatz
Journal Article
2017 On the alignment tolerance of photovoltaic laser power converters
Wagner, L.; Bett, A.W.; Helmers, H.		 Zeitschriftenaufsatz
Journal Article
2017 Power loss mechanisms in monolithic-interconnected six-segment laser power converter
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		 Vortrag
Presentation
2017 GaInP/AlGaAs metal-wrap-through tandem concentrator solar cells
Oliva, E.; Salvetat, T.; Jany, C.; Thibon, R.; Helmers, H.; Steiner, M.; Schachtner, M.; Beutel, P.; Klinger, V.; Moulet, J.-S.; Dimroth, F.		 Zeitschriftenaufsatz
Journal Article
2017 Multi-segment photovoltaic laser power converters and their electrical losses
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		 Konferenzbeitrag
Conference Paper
2017 On the temperature dependence of dual-junction laser power converters
Reichmuth, S.K.; Helmers, H.; Philipps, S.P.; Schachtner, M.; Siefer, G.; Bett, A.W.		 Zeitschriftenaufsatz
Journal Article
2017 Reliable and lightning-safe monitoring of wind turbine rotor blades using optically powered sensors
Worms, K.; Klamouris, C.; Wegh, F.; Meder, L.; Volkmer, D.; Philipps, S.P.; Reichmuth, S.K.; Helmers, H.; Kunadt, A.; Vourvoulakis, J.; Bett, A.W.; Koos, C.; Freude, W.; Leuthold, J.; Stork, W.		 Zeitschriftenaufsatz
Journal Article
2016 Optical power supply of smart sensors using photovoltaic laser power converters
Helmers, H.		 Vortrag
Presentation
2016 III-V multi-junction Metal-Wrap-Through (MWT) concentrator solar cells
Oliva, E.; Salvetat, T.; Jany, C.; Thibon, R.; Helmers, H.; Steiner, M.; Schachtner, M.; Beutel, P.; Klinger, V.; Moulet, J.; Dimroth, F.		 Konferenzbeitrag
Conference Paper
2016 Transient I-V Measurement Set-up for Photovoltaic Laser Power Converters under Monochromatic Irradiance
Reichmuth, S.K.; Helmers, H.; Garza, C.E.; Vahle, D.; Boer, M. de; Stevens, L.; Mundus, M.; Helmers, H.; Bett, A.W.; Siefer, G.		 Konferenzbeitrag
Conference Paper
2016 Photovoltaic laser power converters for wireless optical power supply of sensor systems
Helmers, H.; Bett, A.W.		 Konferenzbeitrag
Conference Paper
2016 Optimal laser wavelength for efficient laser power converter operation over temperature
Höhn, O.; Walker, A.W.; Bett, A.W.; Helmers, H.		 Zeitschriftenaufsatz
Journal Article
2016 Determining the optimal laser wavelength for laser power conversion depending on operation temperature
Höhn, O.; Walker, A.W.; Bett, A.W.; Helmers, H.		 Konferenzbeitrag
Conference Paper
2016 Temperature and injection current dependent electroluminescence for evaluation of single-junction single-segment GaAs laser power converter
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		 Zeitschriftenaufsatz
Journal Article
2016 Integrated Power and Data Transceiver Devices for Power-by-Light Systems - A Concept Study
Helmers, H.; Lackner, D.; Siefer, G.; Oliva, E.; Dimroth, F.; Bett, A.W.		 Konferenzbeitrag
Conference Paper
2016 Influence of injection current and temperature on electroluminescence of GaAs laser power converters
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		 Vortrag
Presentation
2016 Spatial and spectral electroluminescence for single-junction single-segment GaAs laser power converter characterization
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		 Vortrag
Presentation
2015 Photovoltaic Cells with Increased Voltage Output for Optical Power Supply of Sensor Electronics
Helmers, H.; Wagner, L.; Garza, C.E.; Reichmuth, S.K.; Oliva, E.; Philipps, S.P.; Lackner, D.; Bett, A.		 Konferenzbeitrag
Conference Paper
2015 A high-efficiency hybrid high-concentration photovoltaic system
Zimmermann, S.; Helmers, H.; Tiwari, M.K.; Paredes, S.; Michel, B.; Wiesenfarth, M.; Bett, A.W.; Poulikakos, D.		 Zeitschriftenaufsatz
Journal Article
2015 Impact of Photon Recycling and Luminescence Coupling in III-V Photovoltaic Devices
Walker, A.; Höhn, O.; Micha, D.; Wagner, L.; Helmers, H.; Dimroth, F.; Bett, A.		 Konferenzbeitrag
Conference Paper
2015 Impact of photon recycling and luminescence coupling on III-V single and dual junction photovoltaic devices
Walker, A.W.; Höhn, O.; Micha, D.N.; Wagner, L.; Helmers, H.; Bett, A.W.; Dimroth, F.		 Zeitschriftenaufsatz
Journal Article
2014 Modeling of concentrating photovoltaic and thermal systems
Helmers, H.; Bett, A.W.; Parisi, J.; Agert, C.		 Zeitschriftenaufsatz
Journal Article
2014 Photovoltaic cells for optical power and data transmission
Helmers, H.		 Vortrag
Presentation
2014 Lightning-Safe Monitoring of Wind Turbine Rotor Blades Using Optically Powered Sensors
Worms, K.; Klamouris, C.; Wegh, F.; Meder, L.; Volkmer, D.; Phillips, S.; Reichmuth, S.K.; Helmers, H.; Bett, A.W.; Vourvoulakis, J.; Freude, W.; Leuthold, J.; Stork, W.		 Konferenzbeitrag
Conference Paper
2014 III-V Solarzellen für die optische Leistungsübertragung
Helmers, Henning		 Vortrag
Presentation
2014 Temperature-dependent electroluminescence and voltages of multi-junction solar cells
Karcher, C.; Helmers, H.; Schachtner, M.; Dimroth, F.; Bett, A.W.		 Zeitschriftenaufsatz
Journal Article
2014 Photovoltaic cells for optical power and data transmission
Helmers, H.; Philipps, S.P.; Reichmuth, S.K.; Oliva, E.; Lackner, D.; Bett, A.W.		 Vortrag
Presentation
2013 Ko-Generation von Elektrizität und Wärme aus konzentriertem Sonnenlicht: Überblick über Technologie und Anwendungen
Helmers, H.		 Aufsatz in Buch
Book Article
2013 Bandgap determination based on electrical quantum efficiency
Helmers, H.; Karcher, C.; Bett, A.W.		 Zeitschriftenaufsatz
Journal Article
2013 Investigations on the influence of temperature and concentration on solar cell performances
Helmers, H.; Schachtner, M.; Bett, A.W.		 Konferenzbeitrag
Conference Paper
2013 Optical analysis of deviations in a concentrating photovoltaics central receiver system with a flux homogenizer
Helmers, H.; Thor, W.Y.; Schmidt, T.; Rooyen, D.W. van; Bett, A.W.		 Zeitschriftenaufsatz
Journal Article
2013 Photovoltaische Zellen zur optischen Leistungsübertragung
Helmers, H.		 Vortrag
Presentation
2013 Multi-linear performance model for hybrid (C)PVT solar collectors
Helmers, H.; Kramer, K.		 Zeitschriftenaufsatz
Journal Article
2013 Efficiency of dense-array CPVT module with front-side interconnected cells
Polonsky, G.; Shelef, G.; Flitsanov, Y.; Wiesenfarth, M.; Steiner, M.; Helmers, H.; Bett, A.W.; Kribus, A.		 Konferenzbeitrag
Conference Paper
2013 The Interaction of Standards and Innovation: Hybrid Photovoltaic-thermal Collectors
Kramer, K.; Helmers, H.		 Zeitschriftenaufsatz
Journal Article
2013 Advanced liquid cooling in HCPVT systems to achieve higher energy efficiencies
Zimmermann, S.; Helmers, H.; Tiwari, M.K.; Escher, W.; Paredes, S.; Neves, P.; Poulikakos, D.; Wiesenfarth, M.; Bett, A.W.; Michel, B.		 Konferenzbeitrag
Conference Paper
2013 Influence of temperature and irradiance on triple-junction solar subcells
Helmers, H.; Schachtner, M.; Bett, A.W.		 Zeitschriftenaufsatz
Journal Article
2013 Cogeneration of photovoltaic electricity and heat using concentrated solar radiation
Helmers, H.		 Dissertation
Doctoral Thesis
2013 Temperature dependent electroluminescence and voltages of multi-junction solar cells
Karcher, C.; Helmers, H.; Schachtner, M.; Dimroth, F.; Bett, A.W.		 Konferenzbeitrag
Conference Paper
2012 Front-side interconnected large area concentrator cells for compact concentrator modules
Wiesenfarth, M.; Steiner, M.; Helmers, H.; Siefer, G.; Oliva, E.; Dimroth, F.; Shelef, G.; Polonsky, G.; Flitsanov, Y.; Kribus, A.; Bett, A.W.		 Konferenzbeitrag
Conference Paper
2012 Outdoor test setup for concentrating photovoltaic and thermal (CPVT) systems
Helmers, H.; Boos, A.; Jetter, F.; Heimsath, A.; Wiesenfarth, M.; Bett, A.W.		 Konferenzbeitrag
Conference Paper
2012 Advanced concepts in concentrating photovoltaics (CPV)
Wiesenfarth, M.; Helmers, H.; Philipps, S.P.; Steiner, M.; Bett, A.W.		 Konferenzbeitrag
Conference Paper
2011 Recent advances in the development and testing of hybrid PV-thermal collectors
Dupeyrat, P.; Helmers, H.; Fortuin, S.; Kramer, K.		 Konferenzbeitrag
Conference Paper
2011 Halbleiterbauelement im Mehrschichtaufbau und hieraus gebildetes Modul
Wiesenfarth, Maike; Guter, Wolfgang; Helmers, Henning		 Patent
2010 Processing techniques for monolithic interconnection of solar cells at wafer level
Helmers, H.; Olivia, E.; Bronner, W.; Dimroth, F.; Bett, A.W.		 Zeitschriftenaufsatz
Journal Article
2010 Advanced processing techniques used for the development of dual-junction monolithic interconnected modules
Helmers, H.; Oliva, E.; Bronner, W.; Dimroth, F.; Bett, A.W.		 Konferenzbeitrag
Conference Paper
2009 Increasing the efficiency of fluorescent concentrator systems
Goldschmidt, J.C.; Peters, M.; Bösch, A.; Helmers, H.; Dimroth, F.; Glunz, S.W.; Willeke, G.		 Zeitschriftenaufsatz
Journal Article
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