Activities at the FHNW
- Lecturer for Physics at the Institute of Mathematics and Natural Sciences FHNW
- Head of the Physics group
- Applied Research and Developement with industrial partners
Lectures
- Heat and radiation
- Mechanics
- Electromagnetisms
- Acoustics
- Physics Lab for Energy and Environmental Engineers
Reseach interests
Semiconductor Technology
- Laser Diodes
- Photovoltaic cells and modules
Reliability and Failure Mode analysis of semiconductor components and modules
- Development of life test systems and procedures
- Development of accelerated reliability tests and concepts
Assembly technologies
- Materials Physics
- Multiphysics Modelling
- Design and verification
Profile
Education
1995–1999
Doctorate in Physics at the ETH Zurich; Ph.D. Thesis: “Preparation and Characterization of Heteroepitaxial CuInxSey Layers and Cu(In,Ga)Se2 Substrate Solar Cells”
1987–1994
Physics study at the ETH Zurich
Work experience
Since 2013
Professor of Physics at the FHNW
2010–2013
Head High Power Laser Development, II-VI Laser Enterprise AG(*) (Switzerland)
2005–2012
Project Leader High Power Laser Bars, II-VI Laser Enterprise AG(*) (Switzerland)
1999–2015
Senior Scientist Materials and Failure Mode Analysis, II-VI Laser Enterprise AG(*) (Switzerland)
(*) former company names: OCLARO, Bookham, Nortel Networks, JDS Uniphase,Unip
Publications and patents
Publications
Selected publications
- N. Tiwari, M. Krejci, F.-J. Haug, H. Zogg, 12.8% efficiency Cu(In,Ga)xSey solar cell on a flexible polymer sheet, Progress in Photovoltaics: Research and Applications, 7, 393 (1999).
- Krejci, A. N. Tiwari, H. Heinrich, P. Schwander, H. Zogg and G. Kostorz, Rotational twinning in heteroepitaxial CuInSe2 layers on (111) oriented Si substrates. J. Appl. Phys. 8, no.9, 1997, pp. 6100-6106.
- Martin Krejci, Ayodhya N. Tiwari, Solarzellen zum Aufkleben und Rollen, NZZ Neue Zürcher Zeitung, Beilage Technik, 3. Nov. 1999.
- Nadenau*, D. Hariskos*, H.-W. Schock*, M. Krejci, F.-J. Haug, A. N. Tiwari, H. Zogg, G. Kostorz, Microstructural study of the CdS/CuGaSe2 interfacial Region in CuGaSe2 thin film solar cells, Journal of Applied Physics 85, 534-542 (1999). *Institut für phys. Elektronik, Universität Stuttgart
- N. Tiwari, M. Krejci, F.-J. Haug, H. Zogg, V. Zelezny and V. Vorlicek, Heteroepitaxy of CuInxSey: Material for high efficiency and stable thin film solar cells, J. Cryst. Growth, 201, 1057 (1999).
- Paul Commin, René Todt, Martin Krejci, Rainer Bättig, Reinhard Brunner, Norbert Lichtenstein, Oclaro,, Next generation 9xx/10xx nm high power laser diode bars for multi-kilowatt industrial applications, Published in SPIE Proceeding Vol. 8605 (2013), 86050Y
- Krejci, A. Heinrich, J. Müller, T. Bragagna, N. Lichtenstein, Miniaturized high power Er:YAG solid state laser pumped by a single laser diode bar, SPIE Proceedings Vol. 7912 (2011), 79121D.
- Krejci, Y. Gilbert, J. Müller, R. Todt, S. Weiss, N. Lichtenstein, Power scaling of bars toward 85mW per 1μm stripe width reliable output power, SPIE Proceedings Vol. 7198 (2009), 719804.
- P. Müller, H. Zogg, A. Fach, J. John, C. Paglino, A.N. Tiwari, M. Krejci, G. Kostorz*, Reduction of threading dislocation densities in heavily lattice mismatched PbSe on Si(111) by glide. Phys. Rev. Lett. 78, Nr. 14, pp. 3007-3010. *Institute of Applied Physics, ETH-Hönggerberg, CH-8093 Zürich, Switzerland
Patents
- EP1200995: Flexible thin layer solar cell, A. N. Tiwari, M. Krejci, F.-J. Haug and H. Zogg
- US 7173953: Anti-reflection coatings for semiconductor lasers, A. Wittmann, M. Gotza, M. Solar, E.-E. Latta, T. Kellner and M. Krejci
- US 8320419: High Power Semiconductor Laser: M. Krejci, S. Weiss, N. Lichtenstein and H.-J. Troger