K
Kristofer Tvingstedt
Researcher at University of Würzburg
Publications - 68
Citations - 8231
Kristofer Tvingstedt is an academic researcher from University of Würzburg. The author has contributed to research in topics: Organic solar cell & Polymer solar cell. The author has an hindex of 37, co-authored 67 publications receiving 7298 citations. Previous affiliations of Kristofer Tvingstedt include Chemnitz University of Technology & Linköping University.
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Journal ArticleDOI
On the origin of the open-circuit voltage of polymer–fullerene solar cells
TL;DR: It is demonstrated that charge-transfer absorption and emission are shown to be related to each other and Voc is determined by the formation of these states in accordance with the assumptions of the detailed balance and quasi-equilibrium theory.
Journal ArticleDOI
Consensus stability testing protocols for organic photovoltaic materials and devices
Matthew O. Reese,Suren A. Gevorgyan,Mikkel Jørgensen,Eva Bundgaard,Sarah Kurtz,David S. Ginley,Dana C. Olson,Matthew T. Lloyd,Pasquale Morvillo,Eugene A. Katz,Andreas Elschner,Olivier Haillant,Travis Currier,Vishal Shrotriya,Martin Hermenau,Moritz Riede,Kiril R. Kirov,Gregor Trimmel,Thomas Rath,Olle Inganäs,Fengling Zhang,Mattias Andersson,Kristofer Tvingstedt,Monica Lira-Cantu,Darin W. Laird,Christine McGuiness,Srinivas (Jimmy) Gowrisanker,Michael Pannone,Min Xiao,Jens Hauch,Roland Steim,Dean M. DeLongchamp,Roland Rösch,Harald Hoppe,Nieves Espinosa,Antonio Urbina,Gülsah Yaman-Uzunoglu,Jörg-Bernd Bonekamp,Albert J.J.M. van Breemen,Claudio Girotto,Eszter Voroshazi,Frederik C. Krebs +41 more
TL;DR: Procedures for testing organic solar cell devices and modules with respect to stability and operational lifetime are described and generally agreed test conditions and practices are generally agreed to allow ready comparison between laboratories and to help improving the reliability of reported values.
Journal ArticleDOI
Relating the open-circuit voltage to interface molecular properties of donor:acceptor bulk heterojunction solar cells
TL;DR: In this article, the open-circuit voltage of polymer:fullerene bulk heterojunction solar cells is determined by the interfacial charge transfer (CT) states between polymer and fullerene.
Journal ArticleDOI
Intrinsic non-radiative voltage losses in fullerene-based organic solar cells
Johannes Benduhn,Kristofer Tvingstedt,Fortunato Piersimoni,Sascha Ullbrich,Yeli Fan,Yeli Fan,Manuel Tropiano,Kathryn A. McGarry,Olaf Zeika,Moritz Riede,Christopher J. Douglas,Stephen Barlow,Seth R. Marder,Dieter Neher,Donato Spoltore,Koen Vandewal +15 more
TL;DR: In this paper, the authors expose a link between electron-vibrations coupling and non-radiative recombinations, derive a new limit for the efficiency of organic solar cells, and redefine their optimal optical gap.
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Electroluminescence from charge transfer states in polymer solar cells.
TL;DR: The weak but omnipresent electroluminescence from several types of organic polymer is reported and interpreted to originate from interfacial charge transfer state recombination and emphasize EL as a very valuable tool to characterize the charge transferState present in donor/acceptor organic photovoltaic (OPV) cells.