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Anna Köhler
Researcher at University of Bayreuth
Publications - 196
Citations - 13143
Anna Köhler is an academic researcher from University of Bayreuth. The author has contributed to research in topics: Phosphorescence & Singlet state. The author has an hindex of 53, co-authored 180 publications receiving 11558 citations. Previous affiliations of Anna Köhler include University of Potsdam & University of Cambridge.
Papers
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Journal ArticleDOI
Effect of interchain interactions on the absorption and emission of poly(3-hexylthiophene)
Peter J. Brown,D. Steve Thomas,Anna Köhler,Joanne S. Wilson,Ji-Seon Kim,Catherine Ramsdale,Henning Sirringhaus,Richard H. Friend +7 more
TL;DR: In this article, it was shown that the lowest energy feature in the region of the absorption spectrum is associated with an interchain absorption, the intensity of which is correlated with the degree of order in the polymer.
Book ChapterDOI
Charge transport in organic semiconductors.
Heinz Bässler,Anna Köhler +1 more
TL;DR: This chapter considers the influences of electronic coupling between molecular units, disorder, polaronic effects and space charge, and the recent progress made in understanding charge transport on short time scales and short length scales.
Journal ArticleDOI
Triplet states in organic semiconductors
Anna Köhler,Heinz Bässler +1 more
TL;DR: In this article, a review on the photophysical processes associated with the formation of triplet states and their decay, as well as the energy levels and energy transfer processes of the triplet spin states are presented.
Journal ArticleDOI
Iodine Migration and its Effect on Hysteresis in Perovskite Solar Cells.
Cheng Li,Steffen Tscheuschner,Fabian Paulus,Paul E. Hopkinson,Johannes Kießling,Anna Köhler,Yana Vaynzof,Sven Huettner +7 more
TL;DR: The migration and accumulation of iodide ions create a modulation of the respective interfacial barriers causing the hysteresis in solar cells based on methylammonium lead iodide perovskites.
Journal ArticleDOI
Spin-dependent exciton formation in π-conjugated compounds
Joanne S. Wilson,Anoop S. Dhoot,Alex J.A.B. Seeley,Muhammad S. Khan,Anna Köhler,Richard H. Friend +5 more
TL;DR: It is suggested that a spin-dependent process, favouring singlet formation, is effective in the polymer, and that this process is a consequence of the exchange interaction, which will operate on overlapping electron and hole wavefunctions on the same polymer chain at their capture radius.