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Wissenschaftliche Laufbahn von Karsten Bittkau |
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| seit Februar 2005 | Wissenschaftlicher Mitarbeiter am Institut für Energie- und Klimaforschung IEK-5 (Photovoltaik) | |
| Forschungszentrum Jülich GmbH | ||
| April 2004 - Juli 2004 | Wissenschaftlicher Mitarbeiter am Institut für Angewandte Physik | |
| Universität Hamburg | ||
| Februar 2001 - April 2004 | Promotion in Physik am Institut für Angewandte Physik | |
| Universität Hamburg | ||
| Abschluss: Dr. rer. nat. | ||
| April 1996 - Januar 2001 | Studium der Physik an der Universität Hamburg | |
| Abschluss: Diplom | ||
| Juni 1995 | Abitur am Gymnasium Bramfeld (jetzt: Johannes Brahms Gymnasium) in Hamburg | |
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Publikationen von Karsten Bittkau |
| 2024 |
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Enhancing the Selectivity and Transparency of the Electron Contact in Silicon Heterojunction Solar Cells by Phosphorus Catalytic Doping W. Duan, G. Mains, H.T. Gebrewold, K. Bittkau, A. Lambertz, B. Xu, V. Lauterbach, A. Eberst, N. Nicholson, L. Korte, M.A. Yaqin, K. Zhang, Q. Yang, U. Rau, and K. Ding Advanced Functional Materials 34, 2310552 (2024) |
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Thin silicon heterojunction solar cells in perovskite shadow: Bottom cell prospective U. Chime, W. Duan, A. Lambertz, K. Bittkau, V. Lauterbach, K. Ding, U. Rau, T. Merdzhanova, O. Astakhov Solar Energy Materials & Solar Cells 270, 112813 (2024) |
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Impact of Additional PV Weight on the Energy Consumption of Electric Vehicles With Onboard PV N. Patel, K. Bittkau, B. Pieters, E. Sovetkin, K. Ding, and A. Reinders IEEE Journal of Photovoltaics 14, 319-329 (2024) |
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Synergetic Effect of Gas Compositions on Material Properties of n-Type Nanocrystalline Silicon Oxide Prepared by Plasma-Enhanced Chemical Vapor Deposition D. Qiu, W. Duan, A. Lambertz, K. Bittkau, U. Rau, and K. Ding Solar RRL 8, 2400095 (2024) |
| 2023 |
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> 85% indium reduction for high-efficiency silicon heterojunction solar cells with aluminum-doped zinc oxide contacts Q. Tang, W. Duan, A. Lambertz, K. Bittkau, M.A. Yaqin, Y. Zhao, K. Zhang, Q. Yang, D. Qiu, F. Gunkel, M. Weber, U. Rau, and K. Ding Solar Energy Materials & Solar Cells 251, 112120 (2023) |
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Understanding Silicon Heterojunction Solar Cells with nc-SiC/SiO 2 as an Alternate Transparent Passivating Front Contact and Computational Design Optimization H.T. Gebrewold, K. Bittkau, K. Qiu, U. Rau, and K. Ding Solar RRL 7, 2201051 (2023) |
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Impact of the contacting scheme on I-V measurements of metallization-free silicon heterojunction solar cells M. Brinkmann, F. Haase, K. Bothe, K. Bittkau, A. Lambertz, W. Duan, K. Ding, H.-P. Sperlich, A. Waltinger, H. Schulte-Huxel EPJ Photovoltaics 14, 18 (2023) |
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Life-cycle global warming impact of hydrogen transport through pipelines from Africa to Germany O. Kanz, F. Brüggemann, K. Ding, K. Bittkau, U. Rau, A. Reinders Sustainable Energy & Fuels 7, 3014-3024 (2023) |
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Insights into the Si-H Bonding Configuration at the Amorphous/Crystalline Silicon Interface of Silicon Heterojunction Solar Cells by Raman and FTIR Spectroscopy B. Fischer, A. Lambertz, M. Nuys, W. Beyer, W. Duan, K. Bittkau, K. Ding, and U. Rau Advanced Materials 35, 2306351 (2023) |
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Life Cycle Global Warming Impact of Long-Distance Liquid Hydrogen Transport from Africa to Germany O. Kanz, K. Bittkau, K. Ding, U. Rau, A. Reinders Hydrogen 4, 760-775 (2023) |
| 2022 |
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Effect of oxygen and hydrogen flow ratio on indium tin oxide films in rear-junction silicon heterojunction solar cells D. Qiu, W. Duan, A. Lambertz, K. Bittkau, K. Qiu, U. Rau, and K. Ding Solar Energy 231, 578-585 (2022) |
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A route towards high-efficiency silicon heterojunction solar cells W. Duan, A. Lambertz, K. Bittkau, D. Qiu, K. Qiu, U. Rau, and K. Ding Progress in Photovoltaics 30, 384-392 (2022) |
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Optical Optimization Potential of Transparent-Passivated Contacts in Silicon Solar Cells A. Eberst, A. Zamchiy, K. Qiu, P. Winkel, H.T. Gebrewold, A. Lambertz, W. Duan, S. Li, K. Bittkau, T. Kirchartz, U. Rau, K. Ding Solar RRL 6, 2101050 (2022) |
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Transparent Conductive Oxide Sputtering Damage on Contact Passivation in Silicon Heterojunction Solar Cells with Hydrogenated Nanocrystalline Silicon D. Qiu, W. Duan, A. Lambertz, A. Eberst, K. Bittkau, U. Rau, and K. Ding Solar RRL 6, 2200651 (2022) |
| 2021 |
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The Impact of Reflectance Variation in Silicon Heterojunction Solar Cells and Modules on the Perception of Color Differences K. Qiu, K. Bittkau, A. Lambertz, W. Duan, Z. Liang, H. Shen, U. Rau, and K. Ding IEEE Journal of Photovoltaics 11, 306-311 (2021) |
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Influence of Oxygen on Sputtered Titanium-Doped Indium Oxide Thin Films and Their Application in Silicon Heterojunction Solar Cells Z. Yao, W. Duan, P. Steuter, J. Hüpkes, A. Lambertz, K. Bittkau, M. Pomaska, D. Qiu, K. Qiu, Z. Wu, H. Shen, U. Rau, and K. Ding Solar RRL 5, 2000501 (2021) |
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Design of deterministic light-trapping structures for thin silicon heterojunction solar cells S. Nadi, K. Bittkau, F. Lentz, K. Ding, and U. Rau Optics Express 29, 7410-7417 (2021) |
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Improved Infrared Light Management with Transparent Conductive Oxide/Amorphous Silicon Back Reflector in High-Efficiency Silicon Heterojunction Solar Cells W. Duan, K. Bittkau, A. Lambertz, K. Qiu, Z. Yao, P. Steuter, D. Qiu, U. Rau, and K. Ding Solar RRL 5, 2000576 (2021) |
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Transparent-conductive-oxide-free front contacts for high-efficiency silicon heterojunction solar cells S. Li, M. Pomaska, A. Lambertz, W. Duan, K. Bittkau, D. Qiu, Z. Yao, M. Luysberg, P. Steuter, M. Köhler, K. Qiu, R. Hong, H. Shen, F. Finger, T. Kirchartz, U. Rau, and K. Ding Joule 5, 1535-1547 (2021) |
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Utilization of ultra-thin n-type Hydrogenated Nanocrystalline Silicon for Silicon Heterojunction Solar Cells D. Qiu, W. Duan, A. Lambertz, K. Bittkau, K. Qiu, K. Ding 2021 IEEE 48th Photovoltaic Specialists Conference (PVSC), 0806-0808 (2021) |
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Numerical study of Silicon Heterojunction Solar Cells with nc-SiC/SiO 2 Based Transparent Passivating Contact H.T. Gebrewold, K. Bittkau, K. Qiu, and K. Ding 2021 IEEE 48th Photovoltaic Specialists Conference (PVSC), 1115-1117 (2021) |
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Achieving a high Short Circuit Current Density of 40.9 mA/cm² for Two-Side Contacted Silicon Heterojunction Solar Cells by using SiC-based Transparent Passivating Contacts A. Eberst, A. Zamchiy, K. Qiu, A. Lambertz, W. Duan, S. Li, K. Bittkau, S. Haas, F. Finger, T. Kirchartz, U. Rau, and K. Ding 2021 IEEE 48th Photovoltaic Specialists Conference (PVSC), 0300-0302 (2021) |
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Review and Harmonization of the Life-Cycle Global Warming Impact of PV-Powered Hydrogen Production by Electrolysis O. Kanz, K. Bittkau, K. Ding, U. Rau, and A. Reinders Frontiers in Electronics 2, 711103 (2021) |
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Function Analysis of the Phosphine Gas Flow for n-Type Nanocrystalline Silicon Oxide Layer in Silicon Heterojunction Solar Cells D. Qiu, W. Duan, A. Lambertz, Z. Wu, K. Bittkau, K. Qiu, Z. Yao, U. Rau, and K. Ding ACS Applied Energy Materials 4, 7544-7551 (2021) |
| 2020 |
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Front contact optimization for rear-junction SHJ solar cells with ultra-thin n-type nanocrystalline silicon oxide D. Qiu, W. Duan, A. Lambertz, K. Bittkau, P. Steuter, Y. Liu, A. Gad, M. Pomaska, U. Rau, and K. Ding Solar Energy Materials & Solar Cells 209, 110471 (2020) |
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Mapping the conducting channels formed along extended defects in SrTiO3 by means of scanning near-field optical microscopy C. Rodenbücher, K. Bittkau, G. Bihlmayer, D. Wrana, T. Gensch, C. Korte, F. Krok, and K. Szot Scientific reports 10, 17763 (2020) |
| 2019 |
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Low- and high-index self-assembled nanopillars as light outcoupling elements in organic light emitting diodes Y.J. Donie, L.G. Van Reventlow, J.B. Preinfalk, S. Moghadamzadeh, J. Van Leeuwen, T. Merdzhanova, K. Bittkau, U.W. Paetzold, A. Colsmann, U. Lemmer, and G. Gomard Proc. of OSA: Optical Devices and Materials for Solar Energy and Solid-state Lighting, PW1C.3 (2019) |
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Geometrical Light Trapping in Thin c-Si Solar Cells beyond Lambertian Limit K. Bittkau, S.A. Nadi, K. Ding, and U. Rau 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC), 0799-0802 (2019) |
| 2018 |
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Effect of topography-dependent light coupling through a near-field aperture on the local photocurrent of a solar cell Z. Cao, M. Ermes, S. Lehnen, R. Carius, and K. Bittkau Physical Chemistry, Chemical Physics 20, 1098-1104 (2018) |
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Inkjet-printed internal light extraction layers for organic light emitting diodes T. Eiselt, J.B. Preinfalk, K. Bittkau, G. Gomard, T. Hanemann, and U. Lemmer Flexible and Printed Electronics 3, 015007 (2018) |
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Light trapping in thin film silicon solar cells via phase separated disordered nanopillars Y.J. Donie, M. Smeets, A. Egel, F. Lentz, J.B. Preinfalk, A. Mertens, V. Smirnov, U. Lemmer, K. Bittkau, and G. Gomard Nanoscale 10, 6651-6659 (2018) |
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Developing design criteria for organic solar cells using well-absorbing non-fullerene acceptors L. Krückemeier, P. Kaienburg, J. Flohre, K. Bittkau, I. Zonno, B. Krogmeier, and T. Kirchartz Communications Physics 1, 27 (2018) |
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Optical design of spectrally selective interlayers for perovskite/silicon heterojunction tandem solar cells K. Bittkau, T. Kirchartz, and U. Rau Optics Express 26, A750-A760 (2018) |
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Efficient light trapping in silicon heterojunction solar cells via nanoimprint periodic texturing S. Nadi, A. Gad, F. Lentz, Y. Augarten, K. Bittkau, A. Lambertz, D.Y. Kim, L. Ding, A. Wrigley, U. Rau, and K. Ding 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC), 3062-3064 (2018) |
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Rigorous modeling of light absorption in nanostructured materials using a parallel high order finite element time-domain technique A. Gobé, S. Lanteri, U. Aeberhard, and K. Bittkau Proc. of SPIE 10694, 106940F (2018) |
| 2017 |
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Liquid hydridosilane precursor prepared from cyclopentasilane via sonication at low temperatures without the action of light A.P. Cádiz Bedini, S. Muthmann, J. Allgaier, K. Bittkau, F. Finger, and R. Carius Ultrasonics Sonochemistry 34, 289-293 (2017) |
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Analysis of parasitic losses due to intermediate reflectors in silicon tandem solar cells A. Hoffmann, A. Lambertz, S. Haas, T. Merdzhanova, U.W. Paetzold, M. Meier, and K. Bittkau Solar Energy Materials & Solar Cells 163, 185-190 (2017) |
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Photovoltaics: Nanoengineered Materials and Their Functionality in Solar Cells K. Ding, T. Kirchartz, K. Bittkau, A. Lambertz, V. Smirnov, J. Hüpkes, and U. Rau Nanotechnology for Energy Sustainability / Raj, Baldev (Editor) ; Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 181-206 (2017) |
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Broadening of Light Coupling to Waveguide Modes in Solar Cells by Disordered Grating Textures K. Bittkau, A. Hoffmann, U. Paetzold, and R. Carius Applied Sciences 7, 725 (2017) |
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Flexible thin film solar cells on cellulose substrates with improved light management M. Smeets, K. Wilken, K. Bittkau, H. Aguas, L. Pereira, E. Fortunato, R. Martins, and V. Smirnov Phys. Status Solidi A 214, 1700070 (2017) |
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Manipulating the Net Radiative Recombination Rate in Lead Halide Perovskite Films by Modification of Light Outcoupling F. Staub, T. Kirchartz, K. Bittkau, and U. Rau The Journal of Physical Chemistry Letters 8, 5084-5090 (2017) |
| 2016 |
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Comparison of LPCVD and sputter-etched ZnO layers applied as front electrodes in tandem thin-film silicon solar cells E. Moulin, K. Bittkau, M. Ghosh, G. Bugnon, M. Stuckelberger, M. Meier, F.-J. Haug, J. Hüpkes, and C. Ballif Solar Energy Materials & Solar Cells 145, 185-192 (2016) |
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Photon Tunneling in Tandem Solar Cells With Intermediate Reflector A. Hoffmann, K. Bittkau, C. Zhang, M. Meier, R. Carius, and U. Rau IEEE Journal of Photovoltaics 6, 597-603 (2016) |
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Prototyping of nanophotonic grating back contacts for light trapping in planar silicon solar cells M. Smeets, F. Lentz, A. Richter, Y. Augarten, K. Bittkau, K. Ding, R. Carius, U. Rau, and U.W. Paetzold Phys. Status Solidi A 213, 1949-1954 (2016) |
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Towards a Multi-scale Approach to the Simulation of Silicon Hetero-junction Solar Cells U. Aeberhard, P. Czaja, M. Ermes, B. Pieters, G. Chistiakova, K. Bittkau, A. Richter, K. Ding, S. Giusepponi, and M. Celino J. of Green Engineering 5, 11-32 (2016) |
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Post passivation light trapping back contacts for silicon heterojunction solar cells M. Smeets, K. Bittkau, F. Lentz, A. Richter, K. Ding, R. Carius, U. Rau, U.W. Paetzold Nanoscale 8, 18726-18733 (2016) |
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Light Management in Thin Film Solar Cells using Internal Scattering Layers made by Polymer Blend Lithography Y.J. Donie, M. Smeets, V. Smirnov, J.B. Preinfalk, A. Egel, U. Lemmer, K. Bittkau, and G. Gomard Proc. of OSA: Light, Energy and the Environement, PTh2A.6 (2016) |
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Nanophotonic Light Management for Silicon Heterojunction Solar Cells with Planar Passivation Layers - Implementation and Material Perspective M. Smeets, M. Ermes, M. Pomaska, K. Ding, U.W. Paetzold, K. Bittkau Proc. of OSA: Light, Energy and the Environement, PTh3A.5 (2016) |
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Broadening of Light Coupling to Waveguide Modes in Solar Cells by Disordered Grating Textures K. Bittkau, A. Hoffmann, U.W. Paetzold, and R. Carius Proc. of OSA: Light, Energy and the Environement, PTh2A.5 (2016) |
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High-resolution photocurrent mapping of thin-film solar cells using scanning near-field optical microscopy Z. Cao, S. Lehnen, R. Carius, and K. Bittkau Proc. of SPIE, 9890, 98900J (2016) |
| 2015 |
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On the geometry of plasmonic reflection grating back contacts for light trapping in prototype amorphous silicon thin-film solar cells M. Smeets, V. Smirnov, M. Meier, K. Bittkau, R. Carius, U. Rau, and U.W. Paetzold J. of Photonics for Energy 5, 057004 (2015) |
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Coupling Incident Light to Guided Modes in Thin-Film Tandem Solar Cells With Intermediate Reflector A. Hoffmann, K. Bittkau, C. Zhang, T. Merdzhanova, and U. Rau IEEE Journal of Photovoltaics 5, 3-8 (2015) |
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Influence of Interface Textures on Light Management in Thin-Film Silicon Solar Cells With Intermediate Reflector C. Zhang, M. Meier, A. Hoffmann, W. Zhang, K. Bittkau, G. Jost, U.W. Paetzold, M. Ermes, and T. Merdzhanova IEEE Journal of Photovoltaics 5, 33-39 (2015) |
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Random versus periodic: Determining light trapping of randomly textured thin film solar cells by the superposition of periodic surface textures R. Dewan, S. Shrestha, V. Jovanov, J. Hüpkes, K. Bittkau, and D. Knipp Solar Energy Materials & Solar Cells 143, 183-189 (2015) |
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Cloaking of Metal Contacts on Solar Cells M.F. Schumann, S. Wiesendanger, J.C. Goldschmidt, K. Bittkau, U.W. Paetzold, A. Sprafke, R.B. Wehrspohn, C. Rockstuhl, and M. Wegener Proc. of CLEO: Science and Innovations, SW1I.6 (2015) |
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Cloaked contact grids on solar cells by coordinate transformations: designs and prototypes M.F. Schumann, S. Wiesendanger, J.C. Goldschmidt, B. Bläsi, K. Bittkau, U.W. Paetzold, A. Sprafke, R.B. Wehrspohn, C. Rockstuhl, and M. Wegener Optica 2, 850-853 (2015) |
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Angular dependence of light trapping in nanophotonic thin-film solar cells M. Smeets, V. Smirnov, K. Bittkau, M. Meier, R. Carius, U. Rau, and U.W. Paetzold Optics Express 23, A1575 (2015) |
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Nanoscale Investigation of Polarization-Dependent Light Coupling to Individual Waveguide Modes in Nanophotonic Thin-Film Solar Cells U.W. Paetzold, S. Lehnen, K. Bittkau, U. Rau, and R. Carius IEEE Journal of Photovoltaics 5, 1523-1527 (2015) |
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Controlling disorder for improved light management in solar cells G. Gomard, D. Yidenekachew, R.H. Siddique, R. Huenig, H. Hoelscher, K. Bittkau, V. Depauw, R. Peretti, X. Meng, E. Drouard, C. Seassal, and U. Lemmer Proc. of OSA: Light, Energy and the Environement, PTh2B.1 (2015) |
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Opaline backside structures for photon management in solar cells A.N. Sprafke, D. Schneevoigt, F. Bub, R.B. Wehrspohn, A. Hoffmann, K. Bittkau, R. Carius, S. Wiesendanger, and C. Rockstuhl Proc. of OSA: Light, Energy and the Environement, PTu2B.4 (2015) |
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Randomly Textured Surfaces C. Rockstuhl, S. Fahr, F. Lederer, K. Bittkau, T. Beckers, M. Ermes, and R. Carius Photon Management in Solar Cells Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA 91-116 (2015) |
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FP7-CHEETAH Project Knowledge Exchange Portal: an Advanced Tool to Efficiently Bring Information to the European Photovoltaic RTD Community F. Roca, D. Casaburi, K. Bittkau, M.C. Lux-Steiner, I. Lauermann, S.A. Gevorgyan, P. Malbranche, O.N. Aguila, T. Rachow, G. Sánchez-Plaza, P.M. Sommeling, N. Taylor, I.T. Theologitis, K. Van Nieuwenhuysen, and J.M. Kroon 31st European Photovoltaic Solar Energy Conference and Exhibition, Hamburg, Germany, 14 Sep 2015 - 18 Sep 2015 WIP 3198-3202 (2015) |
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Simulation of light in-coupling through an aperture probe to investigate light propagation in a thin layer for opto-electronic application M. Ermes, S. Lehnen, Z. Cao, K. Bittkau, and R. Carius Proceedings of SPIE, 9526, 95260W (2015) |
| 2014 |
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On the geometry of plasmonic reflection grating back contacts for light trapping in prototype amorphous silicon thin-film solar cells M. Smeets, V. Smirnov, M. Meier, K. Bittkau, R. Carius, U. Rau, and U.W. Paetzold J. Photon. Energy 5, 057004 (2014) |
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Nanoscale Observation of Waveguide Modes Enhancing the Efficiency of Solar Cells U.W. Paetzold, S. Lehnen, K. Bittkau, U. Rau, and R. Carius Nano Letters 14, 6599 (2014) |
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Analysis of light propagation in thin-film solar cells by dual-probe scanning near-field optical microscopy S. Lehnen, U.W. Paetzold, M. Ermes, K. Bittkau, and R. Carius Proc. 40th IEEE Photvoltaic Specialist Conference, 3347 (2014) |
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Advancing tandem solar cells by spectrally selective multilayer intermediate reflectors A. Hoffmann, U.W. Paetzold, C. Zhang, T. Merdzhanova, A. Lambertz, C. Ulbrich, K. Bittkau, and U. Rau Optics Express 22, A1270 (2014) |
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Influence of film formation on light-trapping properties of randomly textured silicon thin-film solar cells V. Jovanov, S. Shrestha, J. Hüpkes, M. Ermes, K. Bittkau, and D. Knipp Appl. Phys. Express 7, 082301 (2014) |
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Optimizing the geometry of plasmonic reflection grating back contacts for improved light trapping in prototype amorphous silicon thin-film solar cells M. Smeets, V. Smirnov, M. Meier, K. Bittkau, R. Carius, U. Rau, and U.W. Paetzold Proc. SPIE 9140, 91400D (2014) |
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Optical simulation of photonic random textures for thin-film solar cells K. Bittkau, and A. Hoffmann Proc. SPIE 9140, 91400L (2014) |
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Investigation of the influence of the scanning probe on SNOM near-field images using rigorous simulations including the probe M. Ermes, S. Lehnen, K. Bittkau, and R. Carius Proc. SPIE 9132, 91320G (2014) |
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Disorder improves nanophotonic light trapping in thin-film solar cells U.W. Paetzold, M. Smeets, M. Meier, K. Bittkau, T. Merdzhanova, V. Smirnov, D. Michaelis, C. Waechter, R. Carius, and U. Rau Appl. Phys. Lett. 104, 131102 (2014) |
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Improvement of Light Trapping in Thin-Film Silicon Solar Cells by Combining Periodic and Random Interfaces K. Bittkau, A. Hoffmann, and R. Carius Can. J. Phys. 92, 888 (2014) |
| 2013 |
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Simulation-based analysis of plasmonic light trapping in thin-film silicon solar cells U.W. Paetzold, K. Bittkau, M. Meier, R. Carius, and U. Rau 13th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), 99-100 (2013) |
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In-situ determination of the effective absorbance of thin µc-Si:H layers growing on rough ZnO:Al M. Meier, K. Bittkau, U.W. Paetzold, J. Hüpkes, S. Muthmann, R. Schmitz, A. Mück, and A. Gordijn EPJ Photovoltaics 4, 40602 (2013) |
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Spectrally selective intermediate reflectors for thin-film silicon tandem solar cells A. Hoffmann, U.W. Paetzold, A. Lambertz, O. Höhn, C. Ulbrich, K. Bittkau, and U. Rau Proc. SPIE 8823, 882305 (2013) |
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Reconstruction of SNOM near-field images from rigorous optical simulations by including topography artifacts M. Ermes, S. Lehnen, K. Bittkau, and R. Carius Proc. SPIE 8789, 87890I (2013) |
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Investigation of the impact of the rear-dielectric/silver back reflector design on the optical performance of thin-film silicon solar cells by means of detached reflectors E. Moulin, U.W. Paetzold, K. Bittkau, J. Owen, J. Kirchhoff, A. Bauer, and R. Carius Prog. Photovolt.: Res. Appl. 21, 1236 (2013) |
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Thin-film silicon solar cells applying optically decoupled back reflectors E. Moulin, U.W. Paetzold, K. Bittkau, M. Ermes, L. Ding, L. Fanni, S. Nicolay, J. Kirchhoff, D. Weigand, A. Bauer, A. Lambertz, C. Ballif, and R. Carius Mater. Sci. Eng. B 178, 645 (2013) |
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Comparison of light scattering in solar cells modeled by rigorous and scalar approach M. Ermes, K. Bittkau, and R. Carius J. Appl. Phys. 113, 073104 (2013) |
| 2012 |
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Tuning Light Scattering Properties of Thin-Film Silicon Solar Cells by Means of Scalar Scattering Theory K. Bittkau, M. Ermes, and R. Carius Renewable Energy and the Environment Optics and Photonics Congress, OSA Technical Digest (online) (Optical Society of America, 2012), paper PT2C.4 |
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Plasmonic Reflection-Grating Back Contacts for Light Trapping in Thin-Film Silicon Solar Cells U.W. Paetzold, K. Bittkau, E. Moulin, M. Meier, U. Rau, G. von Plessen, and R. Carius Renewable Energy and the Environment Optics and Photonics Congress, OSA Technical Digest (online) (Optical Society of America, 2012), paper JM3B.2 |
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Optimization of the Solar Cell Structure for the Industrial Implementation in Very Large Area a-Si:H PV Modules M. Vetter, J. Andreu, J.P. Borrajo, M. Fonrodona, P. Otero, J.A. Rodríguez, O. Agustsson, J. Schotsaert, K. Bittkau, R. Carius, A. Gordijn, J. Hüpkes, G. Jost, O. MintMoustapha, J.K. Rath, R.E.I. Schropp, A. Antony, J. Bertomeu, P. Carreras, and F. Kail Proc. 27th European Photovoltaic Solar Energy Conference, 2594 (2012) |
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Influence of the Back Reflector Texture on Light Scattering and Performance of a nip-Type Microcrystalline Silicon Thin-Film Solar Cell M. Ermes, W. Böttler, K. Bittkau, and V. Smirnov Proc. 27th European Photovoltaic Solar Energy Conference, 2628 (2012) |
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Correlation between surface topography and short-circuit current density for thin-film silicon solar cells A. Hoffmann, G. Jost, K. Bittkau, and R. Carius Proc. SPIE 8438, 84381H (2012) |
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Influence of texture modifications in silicon solar cells on absorption in the intrinsic layers M. Ermes, K. Bittkau, and R. Carius Proc. SPIE 8438, 84380I (2012) |
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Light scattering at textured back contacts for n-i-p thin-film silicon solar cells K. Bittkau, W. Böttler, M. Ermes, V. Smirnov, and F. Finger J. Appl. Phys. 111, 083101 (2012) |
| 2011 |
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Investigation of Local Light Scattering Properties of SnO2 Substrates in Amorphous Silicon Solar Cells A. Hoffmann, K. Bittkau, T. Beckers, R. Carius, O. Agustsson, and J. Schotsaert Proc. 26th European Photovoltaic Solar Energy Conference, 2495 (2011) |
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Development of High Performance Industrial TCO Glass for Very Large Area a-Si:H PV Modules M. Vetter, J. Andreu, J.P. Borrajo, A. Martin, J.A. Rodríguez, O. Agustsson, J. Schotsaert, K. Bittkau, R. Carius, A. Gordijn, A. Hoffmann, I.M. Macedo, J.K. Rath, R.E.I. Schropp, A. Antony, J. Bertomeu, and F. Kail Proc. 26th European Photovoltaic Solar Energy Conference, 2676 (2011) |
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Angular resolved scattering by a nano-textured ZnO/silicon interface M. Schulte, K. Bittkau, K. Jäger, M. Ermes, M. Zeman, and B. E. Pieters Appl. Phys. Lett. 99, 111107 (2011) |
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Investigation of local light scattering properties of thin-film silicon solar cells with subwavelength resolution K. Bittkau, A. Hoffmann, J. Owen, and R. Carius MRS Proceedings (2011), 1321, mrss11-1321-a11-04 |
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Characterizing the light trapping properties of textured surfaces with scanning near-field optical microscopy K. Bittkau Advanced Characterization Techniques for Thin Film Solar Cells, Edited by D. Abou-Ras, T. Kirchartz, U. Rau, Wiley-VCH, Berlin, ISBN 978-3-527-41003-3 (2011) |
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Optical scattering properties of a nano-textured ZnO-silicon interface K. Jäger, M. Zeman, M. Schulte, K. Bittkau, A. M. Ermes, and B. E. Pieters Proc. SPIE 8001, 800106 (2011) |
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Modeling of light scattering properties from surface profile in thin-film solar cells by Fourier transform techniques K. Bittkau, M. Schulte, M. Klein, T. Beckers, and R. Carius Thin Solid Films 519, 6538 (2011) |
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Ray tracing for the optics at nano-textured ZnO–air and ZnO–silicon interfaces M. Schulte, K. Bittkau, B. E. Pieters, S. Jorke, H. Stiebig, J. Hüpkes, and U. Rau Prog. Photovolt.: Res. Appl. 19, 724 (2011) |
| 2010 |
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Investigation of trapped light in thin-film silicon solar cells T. Beckers, K. Bittkau, and R. Carius J. Nonlin. Opt. Phys. Mat. 19, 645 (2010) |
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Light-Trapping for Very Thin a-Si:H/µc-Si:H Solar Cells A. Gordijn, K. Bittkau, E. Bunte, C. Haase, J. Hüpkes, J. Kirchhoff, S. Schicho, M. Schulte, and H. Zhu Proc. 25th European Photovoltaic Solar Energy Conference, 2798 (2010) |
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Near-Field Study of Spatially Resolved Light Scattering in Thin-Film Silicon Solar Cells K. Bittkau, T. Beckers, and R. Carius Proc. 25th European Photovoltaic Solar Energy Conference, 2996 (2010) |
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Localized Plasmon Assisted Scattering at the Back Contact of Thin-Film Silicon Solar Cells U.W. Paetzold, E. Moulin, K. Bittkau, B.E. Pieters, R. Carius, and U. Rau Proc. 25th European Photovoltaic Solar Energy Conference, 3036 (2010) |
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High Efficient Very Large Thin Film Silicon Photovoltaic Modules (HELATHIS) M. Vetter, J.P. Borrajo, M. Fonrodona, P. Otero, J.A. Rodriguez, J. Andreu, O. Agustsson, J. Schotsaert, R. Carius, K. Bittkau, E. Bunte, A. Hoffmann, R.E.I. Schropp, J.K. Rath, I.M. Macedo, J. Bertomeu, A. Antony, and S. Portal Proc. 25th European Photovoltaic Solar Energy Conference, 3220 (2010) |
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Comparison and optimization of randomly textured surfaces in thin-film solar cells C. Rockstuhl, S. Fahr, K. Bittkau, T. Beckers, R. Carius, F.-J. Haug, T. Söderström, C. Ballif, and F. Lederer Opt. Exp. 18, A335 (2010) |
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Fourier analysis for the study of light scattering properties of randomly textured ZnO films K. Bittkau, M. Schulte, T. Beckers, and R. Carius Proc. SPIE 7725, 77250N (2010) |
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Ray tracing analysis of light scattering properties of randomly nano-textured ZnO films M. Schulte, K. Bittkau, B. E. Pieters, S. Jorke, H. Stiebig, J. Hüpkes, and U. Rau Proc. SPIE 7717, 77170N (2010) |
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Near-field study of light scattering at rough interfaces of a-Si:H/µc-Si:H tandem solar cells K. Bittkau and T. Beckers Phys. Status Solidi A 207, 661 (2010) |
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Large scale simulations in the realm of nanooptics C. Rockstuhl, C. Etrich, C. Helgert, C. Menzel, T. Paul, S. Fahr, T. Pertsch, J. Dorfmüller, R. Esteban, W. Khunsin, R. Vogelgesang, K. Kern, A. Dmitriev, K. Bittkau, T. Beckers, R. Carius, and F. Lederer Proc. SPIE 7604, 76040D (2010) |
| 2009 |
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The impact of intermediate reflectors on light absorption in tandem solar cells with randomly textured surfaces C. Rockstuhl, F. Lederer, K. Bittkau, T. Beckers, and R. Carius Appl. Phys. Lett. 94, 211101 (2009) |
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Photon Management in Thin Film Solar Cells C. Rockstuhl, S. Fahr, T. Paul, C. Menzel, K. Bittkau, T. Beckers, R. Carius, and F. Lederer Conference on Lasers and Electro-Optics 2009, paper JWA89 |
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Geometric Optics at Nanotextured TCO Interfaces for Solar Cell Application M. Schulte, S. Jorke, B. Pieters, H. Stiebig, K. Bittkau, U. Rau Proc. 24th European Photovoltaic Solar Energy Conference, 2804 (2009) |
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Nanoscale Investigation of Intermediate Reflectors in Tandem Solar Cells with Randomly Textured Surfaces T. Beckers, K. Bittkau, R. Carius, C. Rockstuhl, F. Lederer Proc. 24th European Photovoltaic Solar Energy Conference, 2793 (2009) |
| 2008 |
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Influence of defects in opal photonic crystals on the optical transmission imaged by near-field scanning optical microscopy K. Bittkau, R. Carius, A. Bielawny and R. B. Wehrspohn J. Mater. Sci.: Mater. Electron. 19, S203 (2008) |
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Nanoscale investigation of light-trapping in a-Si:H solar cell structures with randomly textured interfaces K. Bittkau, T. Beckers, S. Fahr, C. Rockstuhl, F. Lederer, and R. Carius Phys. Status Solidi A 205, 2766 (2008) |
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The optical near-field of randomly textured light trapping structures for thin-film solar cells T. Beckers, K. Bittkau, C. Rockstuhl, S. Fahr, F. Lederer, R. Carius Proc. SPIE 7002, 70020D (2008) |
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Designing randomness — the impact of textured surfaces on the efficiency of thin-film solar cells T. Beckers, K. Bittkau, R. Carius, S. Fahr, C. Rockstuhl, F. Lederer Conference on Lasers and Electro-Optics 2008 |
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Nano-scale Investigation of Light Scattering at Randomly Textured Light Trapping Structures for Thin-film Silicon Solar Cells K. Bittkau, T. Beckers, C. Rockstuhl, S. Fahr, F. Lederer, and R. Carius MRS Proceedings (2008), 1101, 1101-KK04-02 |
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Local versus global absorption in thin-film solar cells with randomly textured surfaces C. Rockstuhl, S. Fahr, F. Lederer, K. Bittkau, T. Beckers, and R. Carius Appl. Phys. Lett. 93, 061105 (2008) |
| 2007 |
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Near-field study of optical modes in randomly textured ZnO thin films K. Bittkau and R. Carius Superlattices and Microstructures 42, 47 (2007) |
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Light localization at randomly textured surfaces for solar-cell applications C. Rockstuhl, F. Lederer, K. Bittkau, and R. Carius Appl. Phys. Lett. 91, 171104 (2007) |
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Guided optical modes in randomly textured ZnO thin films imaged by near-field scanning optical microscopy K. Bittkau, R. Carius, and C. Lienau Phys. Rev. B 76, 035330 (2007) |
| 2006 |
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Spin, Charge and Lattice Excitations Investigated by Photoconductivity Spectroscopy C.-M. Hu, Y.S. Gui, N. Mecking, A. Wirthmann, C. Zehnder, K. Bittkau, S. Holland, and D. Heitmann Proc. of Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics, 404 (2006) |
| 2005 |
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Photoconductivity of InxAl1-xAs parabolic quantum wells in the optical-phonon regime K. Bittkau, N. Mecking, Y. S. Gui, Ch. Heyn, D. Heitmann, and C.-M. Hu Phys. Rev. B 71, 035337 (2005) |
| 2004 |
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Einfluss von selbstkonsistenten Umverteilungen und Elektron-Phonon-Wechselwirkung auf kollektive Anregungen in niedrig-dimensionalen Elektronensystemen K. Bittkau Dissertation erschienen im Shaker-Verlag: ISBN 978-3-8322-2785-2 (2004) |
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Intrasubband magnetoplasmon LO-phonon coupling in an InAs antidot array K. Bittkau, C. Zehnder, Ch. Heyn, D. Heitmann, and C.-M. Hu Phys. Rev. B 70, 125314 (2004) |
| 2003 |
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Far-infrared photoconductivity of electrons in an array of nanostructured antidots K. Bittkau, Ch. Menk, Ch. Heyn, D. Heitmann, and C.-M. Hu Phys. Rev. B 68, 195303 (2003) |
| 2002 |
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Filling-factor–dependent oscillations of the coupled intersubband plasmon-LO phonon mode in a tunneling coupled-bilayer system S. Holland, K. Bittkau, C.-M. Hu, Ch. Heyn, and D. Heitmann Phys. Rev. B 66, 233302 (2002) |