L
Lukas Kranz
Researcher at Swiss Federal Laboratories for Materials Science and Technology
Publications - 38
Citations - 3682
Lukas Kranz is an academic researcher from Swiss Federal Laboratories for Materials Science and Technology. The author has contributed to research in topics: Cadmium telluride photovoltaics & Copper indium gallium selenide solar cells. The author has an hindex of 22, co-authored 38 publications receiving 3271 citations.
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Journal ArticleDOI
Potassium-induced surface modification of Cu(In,Ga)Se2 thin films for high-efficiency solar cells
Adrian Chirila,Patrick Reinhard,Fabian Pianezzi,P. Bloesch,Alexander R. Uhl,C.M. Fella,Lukas Kranz,Debora Keller,Christina Gretener,Harald Hagendorfer,Dominik Jaeger,Rolf Erni,Shiro Nishiwaki,Stephan Buecheler,Ayodhya N. Tiwari +14 more
TL;DR: A new sequential post-deposition treatment of the CIGS layer with sodium and potassium fluoride is presented that enables fabrication of flexible photovoltaic devices with a remarkable conversion efficiency due to modified interface properties and mitigation of optical losses in the CdS buffer layer.
Journal ArticleDOI
Highly efficient Cu(In,Ga)Se2 solar cells grown on flexible polymer films
Adrian Chirila,Stephan Buecheler,Fabian Pianezzi,P. Bloesch,Christina Gretener,Alexander R. Uhl,C.M. Fella,Lukas Kranz,Julian Perrenoud,S. Seyrling,R. Verma,Shiro Nishiwaki,Yaroslav E. Romanyuk,G. Bilger,Ayodhya N. Tiwari +14 more
TL;DR: A strong composition gradient in the absorber layer is identified as the main reason for inferior performance and it is shown that, by adjusting it appropriately, very high efficiencies can be obtained.
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Doping of polycrystalline CdTe for high-efficiency solar cells on flexible metal foil
Lukas Kranz,Christina Gretener,Julian Perrenoud,Rafael Schmitt,Fabian Pianezzi,Fabio La Mattina,P. Blösch,Erik Cheah,Adrian Chirila,C.M. Fella,Harald Hagendorfer,Timo Jäger,Shiro Nishiwaki,Alexander R. Uhl,Stephan Buecheler,Ayodhya N. Tiwari +15 more
TL;DR: This work introduces an innovative concept for the controlled doping of the CdTe layer in the inverted device structure by means of evaporation of sub-monolayer amounts of Cu and subsequent annealing, which enables breakthrough efficiencies up to 13.6%.
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Sodium Assisted Sintering of Chalcogenides and Its Application to Solution Processed Cu2ZnSn(S,Se)4 Thin Film Solar Cells
Carolin M. Sutter-Fella,Josua Stuckelberger,Harald Hagendorfer,Fabio La Mattina,Lukas Kranz,Shiro Nishiwaki,Alexander R. Uhl,Yaroslav E. Romanyuk,Ayodhya N. Tiwari +8 more
TL;DR: In this article, a solution-deposited earth-abundant precursors are used to enhance the surface chemisorption of selenium molecules and promote the formation of liquid Na2Sex phases during reactive annealing of the precursor.
Journal ArticleDOI
Highly Transparent and Conductive ZnO: Al thin films from a low temperature aqueous solution approach
Harald Hagendorfer,Karla Lienau,Shiro Nishiwaki,C.M. Fella,Lukas Kranz,Alexander R. Uhl,Dominik Jaeger,Li Luo,Christina Gretener,Stephan Buecheler,Yaroslav E. Romanyuk,Ayodhya N. Tiwari +11 more
TL;DR: A solution deposition approach for high-performance aluminum-doped zinc oxide (AZO) thin films that allows the non-vacuum deposition of AZO on temperature sensitive substrates such as polymer films for flexible and transparent electronics, or inorganic and organic thin film photovoltaics.