Concentrator Optics

R&D Services

Our wide-ranging expertise allows us to support customers wishing to use and optimize concentrator optics in the most varied applications. Our services range from fundamental investigations into optics and material properties through design and simulation of concentrators, to optical characterization using various set-ups of measuring instruments.

Investigations into soiling and degradation

Optical characterization and qualification

Design and optimization of concentrator optics



Concentrator optics concentrate incident radiation onto thermal or photovoltaic receivers. We investigate and develop single stage and multistage concentrator designs based on reflective (e.g. parabolic mirrors, heliostats) or refractive optics (e.g. Fresnel lenses or dielectric secondary concentrators) for linear or spot focusing systems in low, medium and high concentration applications.

Applications are concentrating collectors for solar thermal power plants (CSP) and optical systems for concentrator photovoltaics (CPV). Further information can be found in our Center for Optics and Surface Science and in the Research Topic III-V and Concentrator Photovoltaics.



Selected Research Projects



Highly efficient concentrator module with GaSb-based four-junction solar cell


Receiver and Systems for Low-Concentrating PV (LCPV)


Very Low Angle Beam Spread in PMMA after up to 27 Years as Concentrator Lens in the Sun


Current Publications - Concentrator Optics:

Publication Type
2022 Raytrace3D by Fraunhofer ISE - Accurate and Efficient Ray Tracing for Concentrator Optics
Schöttl, Peter; Bern, Gregor; Nitz, Peter; Torres, Francisco; Graf, Noa Lina
2022 Seven Years of Power Rating following IEC 62670-3
Steiner, Marc; Siefer, Gerald; Martinez Sanchez, Juan Francisco; Dimroth, Frank
Conference Paper
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.
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.
2019 Outdoor Experimental Characterization of Novel High-Efficiency High-Concentrator Photovoltaic (HCPV) modules Using Achromatic Doublet on Glass (ADG) Fresnel Lenses as Primary Optics
Vallerotto, G.; Wiesenfarth, M.; Victoria, M.; Steiner, M.; Anton, I.; Jost, N.; Askins, S.; Sala, G.
Conference Paper
2019 Pushing Energy Yield with Concentrating Photovoltaics
Steiner, Marc; Wiesenfarth, Maike; Martínez Sánchez, Juan Francisco; Siefer, Gerald; Dimroth, Frank
Conference Paper
2018 Operation & maintenance - the key for reliable performance in a CPV power plant
Wüllner, Johannes; Steiner, Marc; Wiesenfarth, Maike; Bett, Andreas
Conference Paper
2018 Trends in Solar Electricity
Bett, A.W.
2018 Challenges in the Design of Concentrator Photovoltaic (CPV) Modules to Achieve Highest Efficiencies
Wiesenfarth, M.; Anton, I.; Bett, A.W.
Journal Article
2018 ALCHEMI - a low cost, high efficiency, optoelectronic HCPV module for 1000x operation
Duggan, G.; Johnson, A.D.; Davies, J.I.; Nitz, Peter; Wiesenfarth, Maike; Rey-Stolle, Ignacio; Jakob, Peter; Iankov, Dimitre; Algora, C.; Garcia, I.; Lombardero, I.; Caño, P.; Alburquerque, Olga; Theristis, Marios; Georghious, George E.
Conference Paper
2016 43 % direct sunlight conversion efficiency using 4J cell with achromatic full glass lens
Steiner, M.; Siefer, G.; Schmidt, T.; Wiesenfarth, M.; Dimroth, F.; Bett, A.W.
Conference Paper
2016 CPV-T Mirror Dish System Combined with Water Desalination Systems
Wiesenfarth, M.; Went, J.; Bösch, A.; Dilger, A.; Kec, T.; Kroll, A.; Koschikowsi, J.; Bett, A.W.
Conference Paper
2016 Rating of CPV modules: Results of module round robins
Steiner, Marc; Siefer, Gerald; Baudrit, Mathieu; Askins, Stephen; Domínguez, César; Antón, Ignacio; Roca, Francesco; Fucci, Raffaele; Cancro, Carmine; Romano, Antonio; Graditi, Giorgio; Pugliatti, Paola Maria; Stefano, Agnese di; Kenny, Robert; Norton, Matthew; Minuto, Alessandro; Morabito, Paolo; Muller, Matthew; Riley, Daniel; Pratt, Larry
Conference Paper
Diese Liste ist ein Auszug aus der Publikationsplattform Fraunhofer-Publica

This list has been generated from the publication platform Fraunhofer-Publica