TY - JOUR A1 - Becker, Christiane A1 - Burger, Sven A1 - Jäger, Klaus T1 - Nanooptische Simulationen für optoelektronische Anwendungen JF - Photonik: Fachzeitschrift für die optischen Technologien Y1 - 2019 SN - 1432-9778 VL - 2019 IS - 2 SP - 42 EP - 45 ER - TY - JOUR A1 - Barth, Carlo A1 - Becker, Christiane T1 - Machine learning classification for field distributions of photonic modes JF - Commun. Phys. Y1 - 2018 U6 - https://doi.org/10.1038/s42005-018-0060-1 VL - 1 SP - 58 ER - TY - JOUR A1 - Manley, Phillip A1 - Abdi, Fatwa F. A1 - Berglund, Sean P. A1 - Islam, A. T. M. Nazmul A1 - Burger, Sven A1 - van de Krol, Roel A1 - Schmid, Martina T1 - Absorption Enhancement for Ultra-Thin Solar Fuel Devices with Plasmonic Gratings JF - ACS Appl. Energy Mater. Y1 - 2018 U6 - https://doi.org/10.1021/acsaem.8b01070 VL - 1 SP - 5810 ER - TY - JOUR A1 - Barth, Carlo A1 - Burger, Sven A1 - Becker, Christiane T1 - Symmetry-Dependency of Anticrossing Phenomena in Slab-Type Photonic Crystals JF - Opt. Express Y1 - 2016 U6 - https://doi.org/10.1364/OE.24.010931 VL - 24 SP - 10931 ER - TY - JOUR A1 - Barth, Carlo A1 - Probst, Jürgen A1 - Herrmann, Sven A1 - Hammerschmidt, Martin A1 - Becker, Christiane T1 - Numerical characterization of symmetry properties for photonic crystals with hexagonal lattice JF - Proc. SPIE N2 - We present a numerical method to characterize the symmetry properties of photonic crystal (PhC) modes based on field distributions, which themselves can be obtained numerically. These properties can be used to forecast specific features of the optical response of such systems, e.g. which modes are allowed to couple to external radiation fields. We use 2D PhCs with a hexagonal lattice of holes in dielectric as an example and apply our technique to reproduce results from analytical considerations. Further, the method is extended to fully vectorial problems in view of 3D PhCs and PhC slabs, its functionality is demonstrated using test cases and, finally, we provide an efficient implementation. The technique can thus readily be applied to output data of all band structure computation methods or even be embedded – gaining additional information about the mode symmetry. Y1 - 2016 U6 - https://doi.org/10.1117/12.2227094 VL - 9885 SP - 988506 ER - TY - JOUR A1 - Jäger, Klaus A1 - Köppel, Grit A1 - Barth, Carlo A1 - Hammerschmidt, Martin A1 - Herrmann, Sven A1 - Burger, Sven A1 - Schmidt, Frank A1 - Becker, Christiane T1 - Sinusoidal gratings for optimized light management in c-Si thin-film solar cells JF - Proc. SPIE Y1 - 2016 U6 - https://doi.org/10.1117/12.2225459 VL - 9898 SP - 989808 ER - TY - JOUR A1 - Becker, Christiane A1 - Burger, Sven A1 - Barth, Carlo A1 - Manley, Phillip A1 - Jäger, Klaus A1 - Eisenhauer, David A1 - Köppel, Grit A1 - Chabera, Pavel A1 - Chen, Junsheng A1 - Zheng, Kaibo A1 - Pullerits, Tönu T1 - Nanophotonic enhanced two-photon excited photoluminescence of perovskite quantum dots JF - ACS Photonics Y1 - 2018 U6 - https://doi.org/10.1021/acsphotonics.8b01199 VL - 5 SP - 4668 ER - TY - JOUR A1 - Manley, Phillip A1 - Song, Min A1 - Burger, Sven A1 - Schmid, Martina T1 - Efficient determination of bespoke optically active nanoparticle distributions JF - J. Opt. Y1 - 2018 U6 - https://doi.org/10.1088/2040-8986/aad114 VL - 20 SP - 085003 ER - TY - JOUR A1 - Jäger, Klaus A1 - Manley, Phillip A1 - Chen, Duote A1 - Tockhorn, Philipp A1 - Eisenhauer, David A1 - Köppel, Grit A1 - Hammerschmidt, Martin A1 - Burger, Sven A1 - Albrecht, Steve A1 - Becker, Christiane T1 - Antireflective nanotextures for monolithic perovskite-silicon tandem solar cells JF - Proc. SPIE Y1 - 2018 U6 - https://doi.org/10.1117/12.2306142 VL - 10688 SP - 106880A ER - TY - JOUR A1 - Abebe, Muluneh G. A1 - Abass, Aimi A1 - Gomard, Guillaume A1 - Zschiedrich, Lin A1 - Lemmer, Uli A1 - Richards, Bryce S. A1 - Rockstuhl, Carsten A1 - Paetzold, Ulrich W. T1 - Rigorous wave-optical treatment of photon recycling in thermodynamics of photovoltaics: Perovskite thin-film solar cells JF - Phys. Rev. B Y1 - 2018 U6 - https://doi.org/10.1103/PhysRevB.98.075141 VL - 98 SP - 075141 ER - TY - JOUR A1 - Tillmann, Peter A1 - Jäger, Klaus A1 - Becker, Christiane T1 - Minimising levelised cost of electricity of bifacial solar panel arrays using Bayesian optimisation JF - Sustain. Energy Fuels Y1 - 2020 U6 - https://doi.org/10.1039/C9SE00750D VL - 4 SP - 254 ER - TY - JOUR A1 - Hammerschmidt, Martin A1 - Döpking, Sandra A1 - Burger, Sven A1 - Matera, Sebastian T1 - Field Heterogeneities and Their Impact on Photocatalysis: Combining Optical and Kinetic Monte Carlo Simulations on the Nanoscale JF - J. Phys. Chem. C Y1 - 2020 U6 - https://doi.org/10.1021/acs.jpcc.9b11469 VL - 124 SP - 3177 ER - TY - JOUR A1 - Manley, Phillip A1 - Walde, Sebastian A1 - Hagedorn, Sylvia A1 - Hammerschmidt, Martin A1 - Burger, Sven A1 - Becker, Christiane T1 - Nanopatterned Sapphire Substrates in Deep-UV LEDs: Is there an Optical Benefit? JF - Opt. Express Y1 - 2020 U6 - https://doi.org/10.1364/OE.379438 VL - 28 SP - 3619 ER - TY - JOUR A1 - Jäger, Klaus A1 - Tillmann, Peter A1 - Becker, Christiane T1 - Detailed illumination model for bifacial solar cells JF - Opt. Express Y1 - 2020 U6 - https://doi.org/10.1364/OE.383570 VL - 28 SP - 4751 ER - TY - JOUR A1 - Würth, Christian A1 - Manley, Phillip A1 - Voigt, Robert A1 - Ahiboz, Doguscan A1 - Becker, Christiane A1 - Resch-Genger, Ute T1 - Metasurface enhanced sensitized photon upconversion: towards highly efficient low power upconversion applications and nano-scale E-field sensors JF - Nano Lett. Y1 - 2020 U6 - https://doi.org/10.1021/acs.nanolett.0c02548 VL - 20 SP - 6682 ER - TY - JOUR A1 - Chen, Duote A1 - Manley, Phillip A1 - Tockhorn, Philipp A1 - Eisenhauer, David A1 - Köppel, Grit A1 - Hammerschmidt, Martin A1 - Burger, Sven A1 - Albrecht, Steve A1 - Becker, Christiane A1 - Jäger, Klaus T1 - Nanophotonic Light Management for Perovskite-Silicon Tandem Solar Cells JF - J. Photonics Energy Y1 - 2018 U6 - https://doi.org/10.1117/1.JPE.8.022601 VL - 8 SP - 022601 ER - TY - JOUR A1 - Eisenhauer, David A1 - Jäger, Klaus A1 - Köppel, Grit A1 - Rech, Bernd A1 - Becker, Christiane T1 - Optical Properties of Smooth Anti-reflective Three-dimensional Textures for Silicon Thin-film Solar Cells JF - Energy Procedia Y1 - 2016 U6 - https://doi.org/10.1016/j.egypro.2016.11.314 VL - 102 SP - 27 EP - 35 ER - TY - JOUR A1 - Eisenhauer, David A1 - Köppel, Grit A1 - Jäger, Klaus A1 - Chen, Duote A1 - Shargaieva, Oleksandra A1 - Sonntag, Paul A1 - Armkreutz, Daniel A1 - Rech, Bernd A1 - Becker, Christiane T1 - Smooth anti-reflective three-dimensional textures for liquid phase crystallized silicon thin-film solar cells on glass JF - Sci. Rep. Y1 - 2017 U6 - https://doi.org/10.1038/s41598-017-02874-y VL - 7 SP - 2658 ER - TY - JOUR A1 - Jäger, Klaus A1 - Köppel, Grit A1 - Eisenhauer, David A1 - Chen, Duote A1 - Hammerschmidt, Martin A1 - Burger, Sven A1 - Becker, Christiane T1 - Optical simulations of advanced light management for liquid-phase crystallized silicon thin-film solar cells JF - Proc. SPIE Y1 - 2017 U6 - https://doi.org/10.1117/12.2273994 VL - 10356 SP - 103560F ER - TY - JOUR A1 - Barth, Carlo A1 - Roder, Sebastian A1 - Brodoceanu, Daniel A1 - Kraus, Tobias A1 - Hammerschmidt, Martin A1 - Burger, Sven A1 - Becker, Christiane T1 - Increased fluorescence of PbS quantum dots in photonic crystals by excitation enhancement JF - Appl. Phys. Lett. Y1 - 2017 U6 - https://doi.org/10.1063/1.4995229 VL - 111 SP - 031111 ER - TY - JOUR A1 - Jäger, Klaus A1 - Barth, Carlo A1 - Hammerschmidt, Martin A1 - Herrmann, Sven A1 - Burger, Sven A1 - Schmidt, Frank A1 - Becker, Christiane T1 - Simulations of sinusoidal nanotextures for coupling light into c-Si thin-film solar cells JF - Opt. Express Y1 - 2016 U6 - https://doi.org/10.1364/OE.24.00A569 VL - 24 SP - A569 ER - TY - JOUR A1 - Hammerschmidt, Martin A1 - Barth, Carlo A1 - Pomplun, Jan A1 - Burger, Sven A1 - Becker, Christiane A1 - Schmidt, Frank T1 - Reconstruction of photonic crystal geometries using a reduced basis method for nonlinear outputs JF - Proc. SPIE N2 - Maxwell solvers based on the hp-adaptive finite element method allow for accurate geometrical modeling and high numerical accuracy. These features are indispensable for the optimization of optical properties or reconstruction of parameters through inverse processes. High computational complexity prohibits the evaluation of the solution for many parameters. We present a reduced basis method (RBM) for the time-harmonic electromagnetic scattering problem allowing to compute solutions for a parameter configuration orders of magnitude faster. The RBM allows to evaluate linear and nonlinear outputs of interest like Fourier transform or the enhancement of the electromagnetic field in milliseconds. We apply the RBM to compute light-scattering off two dimensional photonic crystal structures made of silicon and reconstruct geometrical parameters. Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-58187 VL - 9756 SP - 97561R ER - TY - JOUR A1 - Jäger, Klaus A1 - Köppel, Grit A1 - Hammerschmidt, Martin A1 - Burger, Sven A1 - Becker, Christiane T1 - On accurate simulations of thin-film solar cells with a thick glass superstrate JF - Opt. Express Y1 - 2018 U6 - https://doi.org/10.1364/OE.26.000A99 VL - 26 SP - A99 ER - TY - JOUR A1 - Ahiboz, Doguscan A1 - Andresen, Elina A1 - Manley, Phillip A1 - Resch-Genger, Ute A1 - Würth, Christian A1 - Becker, Christiane T1 - Metasurface-Enhanced Photon Upconversion upon 1550 nm Excitation JF - Adv. Opt. Mater. Y1 - 2021 U6 - https://doi.org/10.1002/adom.202101285 VL - 9 SP - 2101285 ER - TY - JOUR A1 - Yoo, Danbi A1 - Tillmann, Peter A1 - Krauss, Tobias A1 - Sutter, Johannes A1 - Harter, Angelika A1 - Trofimov, Sergei A1 - Naydenov, Boris A1 - Jäger, Klaus A1 - Hauser, Hubert A1 - Becker, Christiane T1 - Comparative Optical Analysis of Imprinted Nano-, Micro- and Biotextures on Solar Glasses for Increased Energy Yield JF - Solar RRL Y1 - 2023 U6 - https://doi.org/10.1002/solr.202300071 VL - 7 SP - 2300071 ER - TY - JOUR A1 - Sekulic, Ivan A1 - Schaible, Jonas A1 - Müller, Gabriel A1 - Plock, Matthias A1 - Burger, Sven A1 - Martínez-Lahuerta, Víctor José A1 - Gaaloul, Naceur A1 - Schneider, Philipp-Immanuel T1 - Physics-informed Bayesian optimization of expensive-to-evaluate black-box functions JF - Mach. Learn. Sci. Technol. N2 - 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. Y1 - 2025 U6 - https://doi.org/10.1088/2632-2153/ae1f5f VL - 6 SP - 040503 PB - IOP Publishing ER - TY - JOUR A1 - Ernst, Marco A1 - Asselineau, Charles-Alexis A1 - Tillmann, Peter A1 - Jäger, Klaus A1 - Becker, Christiane T1 - Modelling bifacial irradiance – Step-by-step comparison and validation of view factor and ray tracing models JF - Appl. Energy Y1 - 2024 U6 - https://doi.org/10.1016/j.apenergy.2024.123574 SN - 0306-2619 VL - 369 SP - 123574 PB - Elsevier BV ER - TY - JOUR A1 - Schaible, Jonas A1 - Nouri, Bijan A1 - Höpken, Lars A1 - Kotzab, Tim A1 - Loevenich, Matthias A1 - Blum, Niklas A1 - Hammer, Annette A1 - Stührenberg, Jonas A1 - Jäger, Klaus A1 - Becker, Christiane A1 - Wilbert, Stefan T1 - Application of nowcasting to reduce the impact of irradiance ramps on PV power plants JF - EPJ Photovolt. Y1 - 2024 U6 - https://doi.org/10.1051/epjpv/2024009 VL - 15 SP - 15 ER - TY - JOUR A1 - Manley, Phillip A1 - Hammerschmidt, Martin A1 - Zschiedrich, Lin A1 - Jäger, Klaus A1 - Becker, Christiane A1 - Burger, Sven T1 - Modelling luminescent coupling in multi-junction solar cells: perovskite silicon tandem case study JF - Proc. SPIE Y1 - 2024 U6 - https://doi.org/10.1117/12.3023941 VL - 13014 SP - 1301404 ER - TY - JOUR A1 - Schaible, Jonas A1 - Winarto, Hanifah A1 - Škorjanc, Viktor A1 - Yoo, Danbi A1 - Zimmermann, Lea A1 - Jäger, Klaus A1 - Sekulic, Ivan A1 - Schneider, Philipp‐Immanuel A1 - Burger, Sven A1 - Wessels, Andreas A1 - Bläsi, Benedikt A1 - Becker, Christiane T1 - Optimizing Aesthetic Appearance of Perovskite Solar Cells Using Color Filters JF - Solar RRL N2 - 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. Y1 - 2025 U6 - https://doi.org/10.1002/solr.202400627 VL - 9 SP - 2400627 PB - Wiley ER - TY - JOUR A1 - Jäger, Klaus A1 - Tejada, Alvarjo A1 - Berwig, Sebastian A1 - Hammerschmidt, Martin A1 - Tockhorn, Philipp A1 - Albrecht, Steve A1 - Becker, Christiane T1 - Optical Simulations of Nanotextured All-Perovskite Tandem Solar Cells JF - Adv. Theory Simul. Y1 - 2025 U6 - https://doi.org/10.1002/adts.202400724 VL - 8 SP - 2400724 ER - TY - JOUR A1 - Jäger, Klaus A1 - Aeberhard, Urs A1 - Alarcon Llado, Esther A1 - Bläsi, Benedikt A1 - Burger, Sven A1 - Ehrler, Bruno A1 - Favre, Wilfried A1 - Fejfar, Antonín A1 - Gageot, Tristan A1 - Gordon, Ivan A1 - Helmers, Henning A1 - Höhn, Oliver A1 - Isabella, Olindo A1 - Jošt, Marko A1 - Ledinský, Martin A1 - Mandal, Jyotirmoy A1 - Manley, Phillip A1 - Muñoz, Delfina A1 - Omair, Zunaid A1 - Ortiz Lizcano, Juan Camilo A1 - Paetzold, Ulrich W. A1 - Raman, Aaswath P. A1 - Sai, Hitoshi A1 - Saive, Rebecca A1 - Schmid, Martina A1 - Yablonovitch, Eli A1 - Becker, Christiane T1 - Optics for terawatt-scale photovoltaics: review and perspectives JF - Adv. Opt. Photonics N2 - 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? Y1 - 2025 U6 - https://doi.org/10.1364/AOP.530556 SN - 1943-8206 VL - 17 IS - 1 SP - 185 EP - 294 PB - Optica Publishing Group ER - TY - JOUR A1 - Tillmann, Peter A1 - Bläsi, Benedikt A1 - Burger, Sven A1 - Hammerschmidt, Martin A1 - Höhn, Oliver A1 - Becker, Christiane A1 - Jäger, Klaus T1 - Optimizing metal grating back reflectors for III-V-on-silicon multijunction solar cells JF - Opt. Express Y1 - 2021 U6 - https://doi.org/10.1364/OE.426761 VL - 29 SP - 22517 ER - TY - JOUR A1 - Jäger, Klaus A1 - Tillmann, Peter A1 - Katz, Eugene A. A1 - Becker, Christiane T1 - Perovskite/silicon tandem solar cells: Effect of luminescent coupling and bifaciality JF - Sol. RRL Y1 - 2021 U6 - https://doi.org/10.1002/solr.202000628 VL - 5 SP - 2000628 ER - TY - JOUR A1 - Manley, Phillip A1 - Segantini, Michele A1 - Ahiboz, Doguscan A1 - Hammerschmidt, Martin A1 - Arnaoutakis, Georgios A1 - MacQueen, Rowan W. A1 - Burger, Sven A1 - Becker, Christiane T1 - Double-layer metasurface for enhanced photon up-conversion JF - APL Photon. Y1 - 2021 U6 - https://doi.org/10.1063/5.0040839 VL - 6 SP - 036103 ER - TY - JOUR A1 - Lopez-Fraguas, Eduardo A1 - Binkowski, Felix A1 - Burger, Sven A1 - Hagedorn, Sylvia A1 - Garcia-Camara, Braulio A1 - Vergaz, Ricardo A1 - Becker, Christiane A1 - Manley, Phillip T1 - Tripling the light extraction efficiency of a deep ultraviolet LED using a nanostructured p-contact JF - Sci. Rep. Y1 - 2022 U6 - https://doi.org/10.1038/s41598-022-15499-7 VL - 12 SP - 11480 ER - TY - JOUR A1 - Tillmann, Peter A1 - Jäger, Klaus A1 - Karsenti, Asher A1 - Kreinin, Lev A1 - Becker, Christiane T1 - Model-Chain Validation for Estimating the Energy Yield of Bifacial Perovskite/Silicon Tandem Solar Cells JF - Sol. RRL Y1 - 2022 U6 - https://doi.org/10.1002/solr.202200079 VL - 6 SP - 2200079 ER - TY - JOUR A1 - Farias-Basulto, Guillermo A1 - Mehlhop, Thede A1 - Otto, Nicolas J. A1 - Bertram, Tobias A1 - Jäger, Klaus A1 - Gall, Stefan A1 - Weinberger, Nikolaus A1 - Schlatmann, Rutger A1 - Lauermann, Iver A1 - Klenk, Reiner A1 - List-Kratochvil, Emil A1 - Kaufmann, Christian A. T1 - Improving Perovskite/CIGS Tandem Solar Cells for Higher Power Conversion Efficiency through Light Management and Bandgap Engineering JF - ACS Appl. Mater. Interfaces Y1 - 2025 U6 - https://doi.org/10.1021/acsami.5c15458 VL - 17 SP - 56250 ER - TY - JOUR A1 - Abdel, Dilara A1 - Relle, Jacob A1 - Kirchartz, Thomas A1 - Jaap, Patrick A1 - Fuhrmann, Jürgen A1 - Burger, Sven A1 - Becker, Christiane A1 - Jäger, Klaus A1 - Farrell, Patricio T1 - How nanotextured interfaces influence the electronics in perovskite solar cells JF - EES Sol. Y1 - 2026 U6 - https://doi.org/10.1039/D5EL00208G ER -