@inproceedings{JaegerManleyEisenhaueretal.2018, author = {J{\"a}ger, Klaus and Manley, Phillip and Eisenhauer, David and Tockhorn, Philipp and Sutter, Johannes and Hammerschmidt, Martin and Burger, Sven and Albrecht, Steve and Becker, Christiane}, title = {Light management with sinusoidal nanotextures}, booktitle = {Light, Energy and the Environment 2018}, doi = {10.1364/OSE.2018.OT5C.5}, pages = {OT5C.5}, year = {2018}, language = {en} } @inproceedings{JaegerHammerschmidtKoeppeletal.2016, author = {J{\"a}ger, Klaus and Hammerschmidt, Martin and K{\"o}ppel, Grit and Burger, Sven and Becker, Christiane}, title = {On Accurate Simulations of Thin-Film Solar Cells With a Thick Glass Superstrate}, booktitle = {Light, Energy and the Environment 2016}, doi = {10.1364/PV.2016.PM3B.5}, pages = {PM3B.5}, year = {2016}, language = {en} } @inproceedings{JaegerBarthHammerschmidtetal.2016, author = {J{\"a}ger, Klaus and Barth, Carlo and Hammerschmidt, Martin and Herrmann, Sven and Burger, Sven and Schmidt, Frank and Becker, Christiane}, title = {Sinusoidal Nanotextures for Enhanced Light Management in Thin-Film Solar Cells}, booktitle = {28th Workshop on Quantum Solar Energy Conversion - (QUANTSOL)}, editor = {European Society for Quantum Solar Energy Conversion,}, year = {2016}, language = {en} } @article{BarthBurgerBecker2016, author = {Barth, Carlo and Burger, Sven and Becker, Christiane}, title = {Symmetry-Dependency of Anticrossing Phenomena in Slab-Type Photonic Crystals}, volume = {24}, journal = {Opt. Express}, doi = {10.1364/OE.24.010931}, pages = {10931}, year = {2016}, language = {en} } @article{BarthProbstHerrmannetal.2016, author = {Barth, Carlo and Probst, J{\"u}rgen and Herrmann, Sven and Hammerschmidt, Martin and Becker, Christiane}, title = {Numerical characterization of symmetry properties for photonic crystals with hexagonal lattice}, volume = {9885}, journal = {Proc. SPIE}, doi = {10.1117/12.2227094}, pages = {988506}, year = {2016}, abstract = {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.}, language = {en} } @article{JaegerKoeppelBarthetal.2016, author = {J{\"a}ger, Klaus and K{\"o}ppel, Grit and Barth, Carlo and Hammerschmidt, Martin and Herrmann, Sven and Burger, Sven and Schmidt, Frank and Becker, Christiane}, title = {Sinusoidal gratings for optimized light management in c-Si thin-film solar cells}, volume = {9898}, journal = {Proc. SPIE}, doi = {10.1117/12.2225459}, pages = {989808}, year = {2016}, language = {en} } @phdthesis{Hammerschmidt2016, author = {Hammerschmidt, Martin}, title = {Optical simulation of complex nanostructured solar cells with a reduced basis method}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:188-fudissthesis000000102429-1}, pages = {XX, 169}, year = {2016}, abstract = {Simulations of optical processes and complex nanostructured devices have become omnipresent in recent years in several fields of current research and industrial applications, not limited to the field of photovoltaics. Devices or processes are optimized with respect to a certain objective where the underlying physical processes are described by partial differential equations. In photovoltaics and photonics electromagnetic fields are investigated which are governed by Maxwell's equations. In this thesis a reduced basis method for the solution of the parameter dependent electromagnetic scattering problem with arbitrary parameters is developed. The method is developed with the specific challenges arising in optical simulations of thin-film silicon solar cells in mind. These are large in domain size and have a complex three-dimensional structure, making optimization tasks infeasible if high-accuracy of the electromagnetic field solution is required. The application of the empirical interpolation methods allows to expand an arbitrary parameter dependence affinely. Thus not only geometries, but also material tensors and source fields can be parameterized. Additionally, the required non-linear post-processing steps of the electromagnetic field to derive energy fluxes or volume absorption are addressed. The reduced basis method allows to reduce the computational costs by orders of magnitude compared to efficient finite element solvers. In addition, an efficient tailored domain decomposition algorithm is presented to model incoherent layers or illuminations in optical systems efficiently. This is of particular interest for solar cells in superstrate configuration where the absorber is illuminated through a glass substrate. The developed methods are employed in application examples taken from collaborations with experimentalists active in the joint lab "BerOSE" (Berlin Joint Lab for Optical Simulations for Energy Research). The optical model of a thin-film silicon multi-junction with incoherent light-trapping is characterized in great detail. The computational gains through hybrid, hp adaptive finite elements are studied and the incoherent domain decomposition algorithm is applied to model a more realistic light-trapping by the glass substrate. The numerical examples of a hexagonal nano-hole array and multi-junction silicon solar cell with a tunable intermediate reflector layer show that the reduced basis method is well suited as a forward solver for modeling and optimization tasks arising in photovoltaics and photonics. Reduced models for illumination and geometric parameters are built providing up to five orders of magnitude savings in computational costs. Resonance phenomena present in the nano-hole array example are detected and the model adapts itself automatically.}, language = {en} } @article{BeckerBurgerBarthetal.2018, author = {Becker, Christiane and Burger, Sven and Barth, Carlo and Manley, Phillip and J{\"a}ger, Klaus and Eisenhauer, David and K{\"o}ppel, Grit and Chabera, Pavel and Chen, Junsheng and Zheng, Kaibo and Pullerits, T{\"o}nu}, title = {Nanophotonic enhanced two-photon excited photoluminescence of perovskite quantum dots}, volume = {5}, journal = {ACS Photonics}, arxiv = {http://arxiv.org/abs/1808.01140}, doi = {10.1021/acsphotonics.8b01199}, pages = {4668}, year = {2018}, language = {en} } @article{ManleySongBurgeretal.2018, author = {Manley, Phillip and Song, Min and Burger, Sven and Schmid, Martina}, title = {Efficient determination of bespoke optically active nanoparticle distributions}, volume = {20}, journal = {J. Opt.}, arxiv = {http://arxiv.org/abs/1901.00334}, doi = {10.1088/2040-8986/aad114}, pages = {085003}, year = {2018}, language = {en} } @article{JaegerManleyChenetal.2018, author = {J{\"a}ger, Klaus and Manley, Phillip and Chen, Duote and Tockhorn, Philipp and Eisenhauer, David and K{\"o}ppel, Grit and Hammerschmidt, Martin and Burger, Sven and Albrecht, Steve and Becker, Christiane}, title = {Antireflective nanotextures for monolithic perovskite-silicon tandem solar cells}, volume = {10688}, journal = {Proc. SPIE}, arxiv = {http://arxiv.org/abs/1805.10152}, doi = {10.1117/12.2306142}, pages = {106880A}, year = {2018}, language = {en} } @article{AbebeAbassGomardetal.2018, author = {Abebe, Muluneh G. and Abass, Aimi and Gomard, Guillaume and Zschiedrich, Lin and Lemmer, Uli and Richards, Bryce S. and Rockstuhl, Carsten and Paetzold, Ulrich W.}, title = {Rigorous wave-optical treatment of photon recycling in thermodynamics of photovoltaics: Perovskite thin-film solar cells}, volume = {98}, journal = {Phys. Rev. B}, arxiv = {http://arxiv.org/abs/1804.02230}, doi = {10.1103/PhysRevB.98.075141}, pages = {075141}, year = {2018}, language = {en} } @article{TillmannJaegerBecker2020, author = {Tillmann, Peter and J{\"a}ger, Klaus and Becker, Christiane}, title = {Minimising levelised cost of electricity of bifacial solar panel arrays using Bayesian optimisation}, volume = {4}, journal = {Sustain. Energy Fuels}, doi = {10.1039/C9SE00750D}, pages = {254}, year = {2020}, language = {en} } @article{HammerschmidtDoepkingBurgeretal.2020, author = {Hammerschmidt, Martin and D{\"o}pking, Sandra and Burger, Sven and Matera, Sebastian}, title = {Field Heterogeneities and Their Impact on Photocatalysis: Combining Optical and Kinetic Monte Carlo Simulations on the Nanoscale}, volume = {124}, journal = {J. Phys. Chem. C}, doi = {10.1021/acs.jpcc.9b11469}, pages = {3177}, year = {2020}, language = {en} } @article{ManleyWaldeHagedornetal.2020, author = {Manley, Phillip and Walde, Sebastian and Hagedorn, Sylvia and Hammerschmidt, Martin and Burger, Sven and Becker, Christiane}, title = {Nanopatterned Sapphire Substrates in Deep-UV LEDs: Is there an Optical Benefit?}, volume = {28}, journal = {Opt. Express}, doi = {10.1364/OE.379438}, pages = {3619}, year = {2020}, language = {en} } @article{JaegerTillmannBecker2020, author = {J{\"a}ger, Klaus and Tillmann, Peter and Becker, Christiane}, title = {Detailed illumination model for bifacial solar cells}, volume = {28}, journal = {Opt. Express}, doi = {10.1364/OE.383570}, pages = {4751}, year = {2020}, language = {en} } @inproceedings{ManleyHammerschmidtBurgeretal.2019, author = {Manley, Phillip and Hammerschmidt, Martin and Burger, Sven and Becker, Christiane}, title = {Nanophotonic Enhancement of Light Out-Coupling for Deep-UV LEDs}, booktitle = {The 10th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META 2019)}, editor = {Zhoudi, Said and Topa, Antonio}, issn = {2429-1390}, pages = {745}, year = {2019}, language = {en} } @inproceedings{BeckerManleyJaegeretal.2019, author = {Becker, Christiane and Manley, Phillip and J{\"a}ger, Klaus and Eisenhauer, David and Sutter, Johannes and Albrecht, Steve and Zheng, Kaibo and Pullerits, Tonu and Burger, Sven}, title = {Nanophotonic enhanced perovskite-silicon solar cell devices}, booktitle = {The 10th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META 2019)}, editor = {Zhoudi, Said and Topa, Antonio}, issn = {2429-1390}, pages = {858}, year = {2019}, language = {en} } @article{WuerthManleyVoigtetal.2020, author = {W{\"u}rth, Christian and Manley, Phillip and Voigt, Robert and Ahiboz, Doguscan and Becker, Christiane and Resch-Genger, Ute}, title = {Metasurface enhanced sensitized photon upconversion: towards highly efficient low power upconversion applications and nano-scale E-field sensors}, volume = {20}, journal = {Nano Lett.}, doi = {10.1021/acs.nanolett.0c02548}, pages = {6682}, year = {2020}, language = {en} } @article{ChenManleyTockhornetal.2018, author = {Chen, Duote and Manley, Phillip and Tockhorn, Philipp and Eisenhauer, David and K{\"o}ppel, Grit and Hammerschmidt, Martin and Burger, Sven and Albrecht, Steve and Becker, Christiane and J{\"a}ger, Klaus}, title = {Nanophotonic Light Management for Perovskite-Silicon Tandem Solar Cells}, volume = {8}, journal = {J. Photonics Energy}, arxiv = {http://arxiv.org/abs/1801.07252}, doi = {10.1117/1.JPE.8.022601}, pages = {022601}, year = {2018}, language = {en} } @inproceedings{JaegerJoštSutteretal.2019, author = {J{\"a}ger, Klaus and Jošt, Marko and Sutter, Johannes and Tockhorn, Philipp and K{\"o}hnen, Eike and Eisenhauer, David and Manley, Phillip and Albrecht, Steve and Becker, Christiane}, title = {Improving Monolithic Perovskite/Silicon Tandem Solar Cells From an Optical Viewpoint}, booktitle = {OSA Advanced Photonics Congress}, doi = {10.1364/PVLED.2019.PM4C.2}, pages = {PM4C.2}, year = {2019}, language = {en} } @phdthesis{Mangalgiri2019, author = {Mangalgiri, Gauri}, title = {Development of Titanium Dioxide Metasurfaces and Nanosoupbowls for Optically Enhancing Silicon Photocathodes}, doi = {10.18452/20160}, year = {2019}, language = {en} } @misc{BeckerJaegerBurger2021, author = {Becker, Christiane and J{\"a}ger, Klaus and Burger, Sven}, title = {Nanophotonics for Solar Energy}, volume = {221}, journal = {Sol. Energy Mater. Sol. Cells}, doi = {10.1016/j.solmat.2020.110916}, pages = {110916}, year = {2021}, language = {en} } @misc{HammerschmidtDoepkingBurgeretal.2017, author = {Hammerschmidt, Martin and D{\"o}pking, Sandra and Burger, Sven and Matera, Sebastian}, title = {Field Heterogeneities and their Impact on Photocatalysis: Combining optical and kinetic Monte Carlo Simulations on the Nanoscale}, issn = {1438-0064}, doi = {10.1021/acs.jpcc.9b11469}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-63690}, year = {2017}, abstract = {Gaining insights into the working principles of photocatalysts on an atomic scale is a challenging task. The obviously high complexity of the reaction mechanism involving photo-excited electrons and holes is one reason. Another complicating aspect is that the electromagnetic field, driving photocatalysis, is not homogeneous on a nanoscale level for particle based catalysts as it is influenced by the particle's shape and size. We present a simple model, inspired by the CO2 reduction on titania anatase, which addresses the impact of these heterogeneities on the photocatalytic kinetics by combining kinetic Monte Carlo with electromagnetic wave simulations. We find that average activity and especially efficiency might differ significantly between different particles. Moreover, we find sizable variation of the catalytic activity on a single facet of a nanocrystal. Besides this quantitative heterogeneity, the coverage situation in general changes laterally on this facet and we observe a concomitant change of the rate-determining steps. This heterogeneity on all levels of photocatalytic activity is masked in experimental studies, where only the spatially averaged activity can be addressed. Microkinetic models based on experimental findings might therefore not represent the true micro- scopic behavior, and mechanistic conclusion drawn from these need to be handled with care.}, language = {en} } @phdthesis{Manley2016, author = {Manley, Phillip}, title = {Simulation of Plasmonic Nanoparticles in Thin Film Solar Cells}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:188-fudissthesis000000102531-2}, year = {2016}, language = {en} } @article{EisenhauerJaegerKoeppeletal.2016, author = {Eisenhauer, David and J{\"a}ger, Klaus and K{\"o}ppel, Grit and Rech, Bernd and Becker, Christiane}, title = {Optical Properties of Smooth Anti-reflective Three-dimensional Textures for Silicon Thin-film Solar Cells}, volume = {102}, journal = {Energy Procedia}, doi = {10.1016/j.egypro.2016.11.314}, pages = {27 -- 35}, year = {2016}, language = {en} } @article{EisenhauerKoeppelJaegeretal.2017, author = {Eisenhauer, David and K{\"o}ppel, Grit and J{\"a}ger, Klaus and Chen, Duote and Shargaieva, Oleksandra and Sonntag, Paul and Armkreutz, Daniel and Rech, Bernd and Becker, Christiane}, title = {Smooth anti-reflective three-dimensional textures for liquid phase crystallized silicon thin-film solar cells on glass}, volume = {7}, journal = {Sci. Rep.}, arxiv = {http://arxiv.org/abs/1609.06997}, doi = {10.1038/s41598-017-02874-y}, pages = {2658}, year = {2017}, language = {en} } @inproceedings{JaegerKoeppelHammerschmidtetal.2017, author = {J{\"a}ger, Klaus and K{\"o}ppel, Grit and Hammerschmidt, Martin and Burger, Sven and Becker, Christiane}, title = {Accurate optical simulations of periodic nanostructures on a thick glass substrate}, booktitle = {29th Workshop on Quantum Solar Energy Conversion - (QUANTSOL)}, year = {2017}, language = {en} } @inproceedings{MangalgiriŠiškinsArslanovaetal.2017, author = {Mangalgiri, Gauri and Šiškins, Makars and Arslanova, Alina and Hammerschmidt, Martin and Manley, Phillip and Riedel, Wiebke and Schmid, Martina}, title = {Highly Transmittive Broadband Dielectric Nanoholes}, booktitle = {CLEO}, doi = {10.1364/CLEO_AT.2017.JTu5A.117}, pages = {JTu5A.117}, year = {2017}, language = {en} } @article{JaegerKoeppelEisenhaueretal.2017, author = {J{\"a}ger, Klaus and K{\"o}ppel, Grit and Eisenhauer, David and Chen, Duote and Hammerschmidt, Martin and Burger, Sven and Becker, Christiane}, title = {Optical simulations of advanced light management for liquid-phase crystallized silicon thin-film solar cells}, volume = {10356}, journal = {Proc. SPIE}, doi = {10.1117/12.2273994}, pages = {103560F}, year = {2017}, language = {en} } @article{BarthRoderBrodoceanuetal.2017, author = {Barth, Carlo and Roder, Sebastian and Brodoceanu, Daniel and Kraus, Tobias and Hammerschmidt, Martin and Burger, Sven and Becker, Christiane}, title = {Increased fluorescence of PbS quantum dots in photonic crystals by excitation enhancement}, volume = {111}, journal = {Appl. Phys. Lett.}, arxiv = {http://arxiv.org/abs/1708.06566}, doi = {10.1063/1.4995229}, pages = {031111}, year = {2017}, language = {en} } @inproceedings{JaegerBarthHammerschmidtetal.2015, author = {J{\"a}ger, Klaus and Barth, Carlo and Hammerschmidt, Martin and Herrmann, Sven and Burger, Sven and Schmidt, Frank and Becker, Christiane}, title = {Sinusoidal Nanotextures for Coupling Light into c-Si Thin-Film Solar Cells}, booktitle = {Light, Energy and the Environement 2015}, doi = {10.1364/PV.2015.PTu4B.3}, pages = {PTu4B.3}, year = {2015}, language = {en} } @inproceedings{BarthJaegerBurgeretal.2015, author = {Barth, Carlo and J{\"a}ger, Klaus and Burger, Sven and Hammerschmidt, Martin and Schmidt, Frank and Becker, Christiane}, title = {Design of Photonic Crystals with Near-Surface Field Enhancement}, booktitle = {Light, Energy and the Environement 2015}, doi = {10.1364/PV.2015.JTu5A.9}, pages = {JTu5A.9}, year = {2015}, language = {en} } @article{JaegerBarthHammerschmidtetal.2016, author = {J{\"a}ger, Klaus and Barth, Carlo and Hammerschmidt, Martin and Herrmann, Sven and Burger, Sven and Schmidt, Frank and Becker, Christiane}, title = {Simulations of sinusoidal nanotextures for coupling light into c-Si thin-film solar cells}, volume = {24}, journal = {Opt. Express}, doi = {10.1364/OE.24.00A569}, pages = {A569}, year = {2016}, language = {en} } @article{HammerschmidtBarthPomplunetal.2016, author = {Hammerschmidt, Martin and Barth, Carlo and Pomplun, Jan and Burger, Sven and Becker, Christiane and Schmidt, Frank}, title = {Reconstruction of photonic crystal geometries using a reduced basis method for nonlinear outputs}, volume = {9756}, journal = {Proc. SPIE}, doi = {10.1117/12.2212482}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-58187}, pages = {97561R}, year = {2016}, abstract = {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.}, language = {en} } @article{JaegerKoeppelHammerschmidtetal.2018, author = {J{\"a}ger, Klaus and K{\"o}ppel, Grit and Hammerschmidt, Martin and Burger, Sven and Becker, Christiane}, title = {On accurate simulations of thin-film solar cells with a thick glass superstrate}, volume = {26}, journal = {Opt. Express}, doi = {10.1364/OE.26.000A99}, pages = {A99}, year = {2018}, language = {en} } @inproceedings{AbebeGomardZschiedrichetal.2017, author = {Abebe, Muluneh G. and Gomard, Guillaume and Zschiedrich, Lin and Rockstuhl, Carsten and Paetzold, Ulrich W. and Abass, Aimi}, title = {Thermodynamics of Photon Recycling in Four Terminal Perovskite/si Tandem Solar Cells}, booktitle = {Optical Nanostructures and Advanced Materials for Photovoltaics}, doi = {10.1364/PV.2017.PM4A.2}, pages = {PM4A.2}, year = {2017}, language = {en} } @article{AhibozAndresenManleyetal.2021, author = {Ahiboz, Doguscan and Andresen, Elina and Manley, Phillip and Resch-Genger, Ute and W{\"u}rth, Christian and Becker, Christiane}, title = {Metasurface-Enhanced Photon Upconversion upon 1550 nm Excitation}, volume = {9}, journal = {Adv. Opt. Mater.}, doi = {10.1002/adom.202101285}, pages = {2101285}, year = {2021}, language = {en} } @inproceedings{AhibozAndresenManleyetal.2021, author = {Ahiboz, Doguscan and Andresen, Elina and Manley, Phillip and Resch Genger, Ute and W{\"u}rth, Christian and Becker, Christiane}, title = {Enhanced Photon Upconversion Using Erbium-Doped Nanoparticles Interacting with Silicon Metasurfaces}, booktitle = {IEEE 48th Photovoltaic Specialists Conference (PVSC)}, doi = {10.1109/PVSC43889.2021.9518495}, pages = {2008 -- 2010}, year = {2021}, language = {en} } @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} }