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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 |
| 2014 |
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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 J. Photovolt. (2014) |
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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 J. Photovolt. (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) |