Andreas Bett

Associate Editor


Frauhofer-Institut for Solare Energiesysteme ISE
Alternative Photovoltaic Technologies
HeidenhofstraBe 2
79110 Freiburg

Phone: 49 761 4588 5257
    Fax: 49 761 4588 9257


Dr. Andreas W. Bett received the Dipl. Degree in physics and the degree in mathematics from the Albert Ludwigs-University, Freiburg, Germany in 1988 and 1989, respectively. The PhD degree in physics was obtained from the University in Konstanz, Germany in 1992. He joined the Fraunhofer Institute for Solar Energy Systems, ISE in Freiburg, Germany in 1987. In 1993 he became the head of the group “III-V – epitaxy and solar cells”. Since 2007 he is head of the division “Materials – Solar Cells and Technology” and since 2009 he is deputy director of the institute.

A part of his division is working on R&D for solar silicon materials. The research includes crystallization processes based on Czochralski, float-zone and vertical gradient freeze methods. The development of new wafering processes and epitaxial growth of Si to fabricate crystalline thin-film Silicon solar cells are also in the focus of this work.

His own research was devoted to III-V semiconductor materials, characterization, solar cells and applications. He published more than 150 papers on these topics. Together with his team he developed the metamorphic growth concept and in 2009 he succeeded to overcome the 41 % efficiency barrier using a metamorphic GaInP/GaInAs/Ge triple-junction solar cell. This achievement was recognized when he was awarded with the 17th European Becquerel Prize for outstanding merits in photovoltaics in 2009. He contributed also on the development of the concentrator module and system technology. In an international effort he introduced together with colleagues from the Ioffe-Institute the FLATCON-concept. Moreover, later he industrialized this concept through co-founding the company Concentrix Solar, today Soitec Solar. In 2012 this achievement was honored when he and Hansjoerg Lerchenmueller were awarded with the high-ranked German Environmental Prize of the DBU for the outstanding contribution to commercialize the CPV technology. While he performs the research on the CPV system he worked to improve the reliability on module level and he became an acitve member in the IEC TC82 WG7 for standardization of CPV technologies.

Further research was performed on the characterization techniques for multi-junction solar cells. This research includes new measurement methods and procedures to calibrate multi-junction solar cells and concentrator solar cells. Dr. Bett is also a member of the European PV Platform WG3 and contributes to the Strategic Research Agenda of Europe. He has organised several international conferences on the topic of CPV and TPV. He served in many scientific committees, among them for the International CPV conference, IEEE-PVSC EC-PVSEC, WCPEC.