@article{YooTillmannKraussetal.2023, author = {Yoo, Danbi and Tillmann, Peter and Krauss, Tobias and Sutter, Johannes and Harter, Angelika and Trofimov, Sergei and Naydenov, Boris and J{\"a}ger, Klaus and Hauser, Hubert and Becker, Christiane}, title = {Comparative Optical Analysis of Imprinted Nano-, Micro- and Biotextures on Solar Glasses for Increased Energy Yield}, volume = {7}, journal = {Solar RRL}, doi = {10.1002/solr.202300071}, pages = {2300071}, year = {2023}, language = {en} } @inproceedings{JaegerBerwigKurpiersetal.2023, author = {J{\"a}ger, Klaus and Berwig, Sebastian and Kurpiers, Jona and Yang, Fengjiu and Tockhorn, Philipp and Albrecht, Steve and Becker, Christiane}, title = {Optical Simulations of Perovskite/Perovskite Tandem Solar Cells}, booktitle = {Integrated Photonics Research, Silicon and Nanophotonics}, doi = {10.1364/IPRSN.2023.JM4D.3}, pages = {JM4D.3}, year = {2023}, language = {en} } @article{SekulicSchaibleMuelleretal.2025, author = {Sekulic, Ivan and Schaible, Jonas and M{\"u}ller, Gabriel and Plock, Matthias and Burger, Sven and Mart{\´i}nez-Lahuerta, V{\´i}ctor Jos{\´e} and Gaaloul, Naceur and Schneider, Philipp-Immanuel}, title = {Physics-informed Bayesian optimization of expensive-to-evaluate black-box functions}, volume = {6}, journal = {Mach. Learn. Sci. Technol.}, publisher = {IOP Publishing}, doi = {10.1088/2632-2153/ae1f5f}, pages = {040503}, year = {2025}, abstract = {Abstract Bayesian optimization with Gaussian process surrogates is a popular approach for optimizing expensive-to-evaluate functions in terms of time, energy, or computational resources. Typically, a Gaussian process models a scalar objective derived from observed data. However, in many real-world applications, the objective is a combination of multiple outputs from physical experiments or simulations. Converting these multidimensional observations into a single scalar can lead to information loss, slowing convergence and yielding suboptimal results. To address this, we propose to use multi-output Gaussian processes to learn the full vector of observations directly, before mapping them to the scalar objective via an inexpensive analytical function. This physics-informed approach retains more information from the underlying physical processes, improving surrogate model accuracy. As a result, the approach accelerates optimization and produces better final designs compared to standard implementations.}, language = {en} } @article{ErnstAsselineauTillmannetal.2024, author = {Ernst, Marco and Asselineau, Charles-Alexis and Tillmann, Peter and J{\"a}ger, Klaus and Becker, Christiane}, title = {Modelling bifacial irradiance - Step-by-step comparison and validation of view factor and ray tracing models}, volume = {369}, journal = {Appl. Energy}, publisher = {Elsevier BV}, issn = {0306-2619}, doi = {10.1016/j.apenergy.2024.123574}, pages = {123574}, year = {2024}, language = {en} } @article{SchaibleNouriHoepkenetal.2024, author = {Schaible, Jonas and Nouri, Bijan and H{\"o}pken, Lars and Kotzab, Tim and Loevenich, Matthias and Blum, Niklas and Hammer, Annette and St{\"u}hrenberg, Jonas and J{\"a}ger, Klaus and Becker, Christiane and Wilbert, Stefan}, title = {Application of nowcasting to reduce the impact of irradiance ramps on PV power plants}, volume = {15}, journal = {EPJ Photovolt.}, doi = {10.1051/epjpv/2024009}, pages = {15}, year = {2024}, language = {en} } @article{ManleyHammerschmidtZschiedrichetal.2024, author = {Manley, Phillip and Hammerschmidt, Martin and Zschiedrich, Lin and J{\"a}ger, Klaus and Becker, Christiane and Burger, Sven}, title = {Modelling luminescent coupling in multi-junction solar cells: perovskite silicon tandem case study}, volume = {13014}, journal = {Proc. SPIE}, arxiv = {http://arxiv.org/abs/2409.15987}, doi = {10.1117/12.3023941}, pages = {1301404}, year = {2024}, language = {en} } @inproceedings{SchaibleYooWinartoetal.2024, author = {Schaible, Jonas and Yoo, Danbi and Winarto, Hanifa and Miaskiewicz, Alexandra and Albrecht, Steve and Wessels, Andreas and Bl{\"a}si, Benedikt and Burger, Sven and Jaeger, Klaus and Becker, Christiane}, title = {On aesthetical appearance of colored perovskite solar modules}, volume = {PC13014}, booktitle = {Proc. SPIE}, publisher = {SPIE}, doi = {10.1117/12.3017427}, pages = {PC1301406}, year = {2024}, language = {en} } @inproceedings{BeckerBlaesiBurgeretal.2024, author = {Becker, Christiane and Bl{\"a}si, Benedikt and Burger, Sven and Ehrler, Bruno and Gordon, Ivan and Isabella, Olindo and J{\"a}ger, Klaus and Jost, Marko and Manley, Phillip and Mu{\~n}oz, Delfina and Paetzold, Ulrich W. and Sai, Hitoshi and Yablonovitch, Eli}, title = {Optical challenges for terawatt-scale photovoltaics}, volume = {PC13014}, booktitle = {Proc. SPIE}, publisher = {SPIE}, doi = {10.1117/12.3016415}, pages = {PC1301401}, year = {2024}, language = {en} } @article{SchaibleWinartoŠkorjancetal.2025, author = {Schaible, Jonas and Winarto, Hanifah and Škorjanc, Viktor and Yoo, Danbi and Zimmermann, Lea and J{\"a}ger, Klaus and Sekulic, Ivan and Schneider, Philipp-Immanuel and Burger, Sven and Wessels, Andreas and Bl{\"a}si, Benedikt and Becker, Christiane}, title = {Optimizing Aesthetic Appearance of Perovskite Solar Cells Using Color Filters}, volume = {9}, journal = {Solar RRL}, publisher = {Wiley}, doi = {10.1002/solr.202400627}, pages = {2400627}, year = {2025}, abstract = {The significance of color aesthetics in photovoltaic (PV) modules gains importance, especially in design-centric applications like building-integrated PVs. Color filters based on distributed Bragg reflectors, consisting of alternating thin-film layers of different refractive indices, can modify the appearance of standard silicon modules. This approach is also extended to optimize the color appearance of emerging PV technologies such as perovskite solar cells, which typically exhibit a less appealing gray-brownish appearance. In this contribution, perovskite solar-cell stacks combined with MorphoColor color filters are presented. Angular-resolved reflectance simulations based on wave optics and ray tracing with experimental data are validated, and the color appearance from various viewing angles is evaluated. Additionally, the impact of individual layers on color appearance and the maximum achievable short-circuit current density in the perovskite solar cell is investigated. By applying Bayesian optimization, the color distance is minimized to the targeted appearance. Tailoring the bridging layers between the color filter and the perovskite solar cell is found to strongly influence the color impression due to the coherently combined color filter and perovskite solar cell. The presented color optimization concept allows to customize the aesthetics of emerging PV thin-film technologies such as perovskite solar cells.}, language = {en} } @article{JaegerTejadaBerwigetal.2025, author = {J{\"a}ger, Klaus and Tejada, Alvarjo and Berwig, Sebastian and Hammerschmidt, Martin and Tockhorn, Philipp and Albrecht, Steve and Becker, Christiane}, title = {Optical Simulations of Nanotextured All-Perovskite Tandem Solar Cells}, volume = {8}, journal = {Adv. Theory Simul.}, doi = {10.1002/adts.202400724}, pages = {2400724}, year = {2025}, language = {en} } @inproceedings{JaegerBurgerAeberhardetal.2024, author = {J{\"a}ger, Klaus and Burger, Sven and Aeberhard, Urs and Llado, Esther Alarcon and Bl{\"a}si, Benedikt and Ehrler, Bruno and Favre, Wilfried and Fejfar, Anton{\´i}n and Gageot, Tristan and Gordon, Ivan and Helmers, Henning and H{\"o}hn, Oliver and Isabella, Olindo and Jošt, Marko and Ledinsk{\´y}, Martin and Mandal, Jyotirmoy and Manley, Phillip and Munoz, Delfina and Lizcano, Juan Camilo Ortiz and Paetzold, Ulrich W. and Raman, Aaswath P. and Sai, Hitoshi and Saive, Rebecca and Schmid, Martina and Yablonovitch, Eli and Becker, Christiane}, title = {A Roadmap on Optics for Terawatt Scale Photovoltaics}, booktitle = {Advanced Photonics Congress 2024}, publisher = {Optica Publishing Group}, doi = {10.1364/SELED.2024.STu2G.5}, pages = {STu2G.5}, year = {2024}, language = {en} } @inproceedings{SchaibleWinartoSkorjancetal.2025, author = {Schaible, Jonas and Winarto, Hanifah and Skorjanc, Victor and Yoo, Danbi and Zimmermann, Lea and Wessels, Andreas and J{\"a}ger, Klaus and Sekulic, Ivan and Schneider, Philipp-Immanuel and Bl{\"a}si, Benedikt and Burger, Sven and Becker, Christiane}, title = {Optimization strategies for colorful thin film solar cells}, volume = {PC13361}, booktitle = {Proc. SPIE}, doi = {10.1117/12.3041408}, pages = {PC133610E}, year = {2025}, language = {en} } @article{JaegerAeberhardAlarconLladoetal.2025, author = {J{\"a}ger, Klaus and Aeberhard, Urs and Alarcon Llado, Esther and Bl{\"a}si, Benedikt and Burger, Sven and Ehrler, Bruno and Favre, Wilfried and Fejfar, Anton{\´i}n and Gageot, Tristan and Gordon, Ivan and Helmers, Henning and H{\"o}hn, Oliver and Isabella, Olindo and Jošt, Marko and Ledinsk{\´y}, Martin and Mandal, Jyotirmoy and Manley, Phillip and Mu{\~n}oz, Delfina and Omair, Zunaid and Ortiz Lizcano, Juan Camilo and Paetzold, Ulrich W. and Raman, Aaswath P. and Sai, Hitoshi and Saive, Rebecca and Schmid, Martina and Yablonovitch, Eli and Becker, Christiane}, title = {Optics for terawatt-scale photovoltaics: review and perspectives}, volume = {17}, journal = {Adv. Opt. Photonics}, number = {1}, publisher = {Optica Publishing Group}, issn = {1943-8206}, doi = {10.1364/AOP.530556}, pages = {185 -- 294}, year = {2025}, abstract = {Photovoltaics, a mature technology, is set to play a vital role in achieving a carbon-free energy system. This article examines the pivotal role of optics in advancing photovoltaics. We identify key scientific research areas where the optics community can make significant contributions. We are guided by the central question: How can optics facilitate the large-scale deployment of photovoltaics necessary for decarbonizing our societies?}, language = {en} } @inproceedings{JaegerMandalRandetal.2025, author = {J{\"a}ger, Klaus and Mandal, Jyotirmoy and Rand, Barry P. and Meggers, Forrest and Becker, Christiane}, title = {Thermal Management of Solar Modules with Infrared-Antireflective Coatings}, volume = {SOLITH}, booktitle = {Advanced Photonics Congress}, doi = {10.1364/SOLITH.2025.SM4E.2}, pages = {SM4E.2}, year = {2025}, language = {en} } @article{TillmannBlaesiBurgeretal.2021, author = {Tillmann, Peter and Bl{\"a}si, Benedikt and Burger, Sven and Hammerschmidt, Martin and H{\"o}hn, Oliver and Becker, Christiane and J{\"a}ger, Klaus}, title = {Optimizing metal grating back reflectors for III-V-on-silicon multijunction solar cells}, volume = {29}, journal = {Opt. Express}, doi = {10.1364/OE.426761}, pages = {22517}, year = {2021}, language = {en} } @misc{JaegerSutterSchneideretal.2021, author = {J{\"a}ger, Klaus and Sutter, Johannes and Schneider, Philipp-Immanuel and Hammerschmidt, Martin and Becker, Christiane}, title = {Optical simulations of nanotextured perovskite/silicon tandem solar cell}, journal = {HZB Data Service}, doi = {10.5442/ND000005}, year = {2021}, language = {en} } @inproceedings{TillmannJaegerKatzetal.2021, author = {Tillmann, Peter and J{\"a}ger, Klaus and Katz, Eugene and Becker, Christiane}, title = {Relaxed current-matching constraints by bifacial operation and luminescent coupling in perovskite/silicon tandem solar cells}, booktitle = {2021 IEEE 48th Photovoltaic Specialists Conference (PVSC)}, doi = {10.1109/PVSC43889.2021.9518891}, pages = {1086}, year = {2021}, language = {en} } @inproceedings{TockhornSutterCruzetal.2022, author = {Tockhorn, Philipp and Sutter, Johannes and Cruz, Alexandros and Wagner, Philipp and J{\"a}ger, Klaus and Yoo, Danbi and Lang, Felix and Grischek, Max and Li, Bor and Al-Ashouri, Amran and K{\"o}hnen, Eike and Stolterfoht, Martin and Neher, Dieter and Schlatmann, Rutger and Rech, Bernd and Stannowski, Bernd and Albrecht, Steve and Becker, Christiane}, title = {Nanooptically Enhanced Perovskite/Silicon Tandem Solar Cells with 29.80\% Power Conversion Efficiency}, booktitle = {OSA Adv. Photonics}, doi = {10.1364/NOMA.2022.JTu4H.2}, pages = {JTu4H.2}, year = {2022}, language = {en} } @phdthesis{Tillmann2023, author = {Tillmann, Peter}, title = {Optimizing bifacial tandem solar cells for realistic operation conditions}, doi = {10.17169/refubium-39571}, year = {2023}, language = {en} } @inproceedings{JaegerTillmannKatzetal.2020, author = {J{\"a}ger, Klaus and Tillmann, Peter and Katz, Eugene A. and Becker, Christiane}, title = {Simulating bifacial perovskite/silicon tandem solar cells in large PV fields}, booktitle = {OSA Advanced Photonics Congress}, doi = {10.1364/PVLED.2020.PvTh1G.3}, pages = {PvTh1G.3}, year = {2020}, language = {en} } @article{JaegerTillmannKatzetal.2021, author = {J{\"a}ger, Klaus and Tillmann, Peter and Katz, Eugene A. and Becker, Christiane}, title = {Perovskite/silicon tandem solar cells: Effect of luminescent coupling and bifaciality}, volume = {5}, journal = {Sol. RRL}, arxiv = {http://arxiv.org/abs/2008.13696}, doi = {10.1002/solr.202000628}, pages = {2000628}, year = {2021}, language = {en} } @article{ManleySegantiniAhibozetal.2021, author = {Manley, Phillip and Segantini, Michele and Ahiboz, Doguscan and Hammerschmidt, Martin and Arnaoutakis, Georgios and MacQueen, Rowan W. and Burger, Sven and Becker, Christiane}, title = {Double-layer metasurface for enhanced photon up-conversion}, volume = {6}, journal = {APL Photon.}, arxiv = {http://arxiv.org/abs/2012.03587}, doi = {10.1063/5.0040839}, pages = {036103}, year = {2021}, language = {en} } @inproceedings{ManleyKruegerZschiedrichetal.2022, author = {Manley, Phillip and Kr{\"u}ger, Jan and Zschiedrich, Lin and Hammerschmidt, Martin and Bodermann, Bernd and K{\"o}ning, Rainer and Schneider, Philipp-Immanuel}, title = {Elementary, my dear Zernike: model order reduction for accelerating optical dimensional microscopy}, volume = {266}, booktitle = {EPJ Web Conf.}, doi = {10.1051/epjconf/202226610010}, pages = {10010}, year = {2022}, language = {en} } @inproceedings{JaegerSutterTockhornetal.2022, author = {J{\"a}ger, Klaus and Sutter, Johannes and Tockhorn, Philipp and Hammerschmidt, Martin and Schneider, Philipp-Immanuel and Albrecht, Steve and Becker, Christiane}, title = {Improving perovskite/silicon tandem solar cells with optical simulations}, volume = {PC12150}, booktitle = {Proc. SPIE}, doi = {10.1117/12.2621255}, pages = {PC1215001}, year = {2022}, language = {en} } @article{LopezFraguasBinkowskiBurgeretal.2022, author = {Lopez-Fraguas, Eduardo and Binkowski, Felix and Burger, Sven and Hagedorn, Sylvia and Garcia-Camara, Braulio and Vergaz, Ricardo and Becker, Christiane and Manley, Phillip}, title = {Tripling the light extraction efficiency of a deep ultraviolet LED using a nanostructured p-contact}, volume = {12}, journal = {Sci. Rep.}, doi = {10.1038/s41598-022-15499-7}, pages = {11480}, year = {2022}, language = {en} } @article{TillmannJaegerKarsentietal.2022, author = {Tillmann, Peter and J{\"a}ger, Klaus and Karsenti, Asher and Kreinin, Lev and Becker, Christiane}, title = {Model-Chain Validation for Estimating the Energy Yield of Bifacial Perovskite/Silicon Tandem Solar Cells}, volume = {6}, journal = {Sol. RRL}, doi = {10.1002/solr.202200079}, pages = {2200079}, year = {2022}, language = {en} } @article{FariasBasultoMehlhopOttoetal.2025, author = {Farias-Basulto, Guillermo and Mehlhop, Thede and Otto, Nicolas J. and Bertram, Tobias and J{\"a}ger, Klaus and Gall, Stefan and Weinberger, Nikolaus and Schlatmann, Rutger and Lauermann, Iver and Klenk, Reiner and List-Kratochvil, Emil and Kaufmann, Christian A.}, title = {Improving Perovskite/CIGS Tandem Solar Cells for Higher Power Conversion Efficiency through Light Management and Bandgap Engineering}, volume = {17}, journal = {ACS Appl. Mater. Interfaces}, doi = {10.1021/acsami.5c15458}, pages = {56250}, year = {2025}, language = {en} } @article{AbdelRelleKirchartzetal.2026, author = {Abdel, Dilara and Relle, Jacob and Kirchartz, Thomas and Jaap, Patrick and Fuhrmann, J{\"u}rgen and Burger, Sven and Becker, Christiane and J{\"a}ger, Klaus and Farrell, Patricio}, title = {How nanotextured interfaces influence the electronics in perovskite solar cells}, journal = {EES Sol.}, arxiv = {http://arxiv.org/abs/2506.10691}, doi = {10.1039/D5EL00208G}, year = {2026}, language = {en} }