G
Gerald Siefer
Researcher at Fraunhofer Society
Publications - 137
Citations - 5614
Gerald Siefer is an academic researcher from Fraunhofer Society. The author has contributed to research in topics: Solar cell & Photovoltaic system. The author has an hindex of 31, co-authored 123 publications receiving 4955 citations.
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Journal ArticleDOI
InP Nanowire Array Solar Cells Achieving 13.8% Efficiency by Exceeding the Ray Optics Limit
Jesper Wallentin,Nicklas Anttu,Damir Asoli,Maria Huffman,Ingvar Åberg,Martin Magnusson,Gerald Siefer,Peter Fuss-Kailuweit,Frank Dimroth,Bernd Witzigmann,Hongqi Xu,Hongqi Xu,Lars Samuelson,Knut Deppert,Magnus T. Borgström +14 more
TL;DR: It is reported that arrays of p-i-n InP nanowires (that switch from positive to negative doping), grown to millimeter lengths, can be optimized by varying the nanowire diameter and length of the n-doped segment, which are comparable to the best planar InP photovoltaics.
Journal ArticleDOI
Current-matched triple-junction solar cell reaching 41.1% conversion efficiency under concentrated sunlight
Wolfgang Guter,J. Schöne,Simon P. Philipps,Marc Steiner,Gerald Siefer,A. Wekkeli,Elke Welser,E. Oliva,Andreas W. Bett,Frank Dimroth +9 more
TL;DR: In this article, a metamorphic Ga0.35In0.17As/Ge triple-junction solar cell is shown to provide current-matching of all three subcells and thus composes a device structure with virtually ideal band gap combination.
Journal ArticleDOI
Wafer bonded four-junction GaInP/GaAs//GaInAsP/GaInAs concentrator solar cells with 44.7% efficiency
Frank Dimroth,Matthias Grave,Paul Beutel,Ulrich Fiedeler,Christian Karcher,T.N.D. Tibbits,E. Oliva,Gerald Siefer,Michael Schachtner,A. Wekkeli,Andreas W. Bett,Rainer Krause,M. Piccin,Nicolas Blanc,Charlotte Drazek,Eric Guiot,Bruno Ghyselen,Thierry Salvetat,Aurélie Tauzin,Thomas Signamarcheix,Anja Dobrich,Thomas Hannappel,Klaus Schwarzburg +22 more
TL;DR: In this paper, a GaAs-based top tandem solar cell structure was bonded to an InP-based bottom tandem cell with a difference in lattice constant of 3.7%.
Journal ArticleDOI
Four-Junction Wafer-Bonded Concentrator Solar Cells
Frank Dimroth,T.N.D. Tibbits,M. Niemeyer,Felix Predan,Paul Beutel,Christian Karcher,E. Oliva,Gerald Siefer,David Lackner,Peter Fus-Kailuweit,Andreas Bett,Rainer Krause,Charlotte Drazek,Eric Guiot,Jocelyne Wasselin,Aurélie Tauzin,Thomas Signamarcheix +16 more
TL;DR: In this article, three cell architectures are presented using the same two top junctions of GaInP/GaAs but different infrared absorbers based on Germanium, GaSb, or GaInAs on InP.
Journal ArticleDOI
III–V-on-silicon solar cells reaching 33% photoconversion efficiency in two-terminal configuration
Romain Cariou,Romain Cariou,Jan Benick,Frank Feldmann,Frank Feldmann,Oliver Höhn,Hubert Hauser,Paul Beutel,Nasser Razek,Markus Wimplinger,Benedikt Bläsi,David Lackner,Martin Hermle,Gerald Siefer,Stefan W. Glunz,Stefan W. Glunz,Andreas W. Bett,Frank Dimroth +17 more
TL;DR: Cariou et al. as discussed by the authors used wafer bonding to permanently join a GaInP/GaAs top cell with a silicon bottom cell, achieving a 1-sun AM1.5G conversion efficiency of 33.3%.