Triplet diffusion in singlet exciton fission sensitized pentacene solar cells

Tabachnyk, M., Ehrler, B., Bayliss, S. , Friend, R. H. and Greenham, N. C. (2013) Triplet diffusion in singlet exciton fission sensitized pentacene solar cells. Applied Physics Letters, 103(15), 153302. (doi: 10.1063/1.4824420)

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Singlet fission sensitized photovoltaics have the potential to surpass the Shockley-Queisser limit for a single-junction structure. We investigate the dynamics of triplet excitons resulting from singlet fission in pentacene and their ionization at a C60 heterojunction. We model the generation and diffusion of excitons to predict the spectral response. We find the triplet diffusion length in polycrystalline pentacene to be 40 nm. Poly(3-hexylthiophene) between the electrode and pentacene works both to confine triplet excitons and also to transfer photogenerated singlet excitons into pentacene with 30% efficiency. The lower bound for the singlet fission quantum efficiency in pentacene is 180 ± 15%.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Bayliss, Dr Sam
Authors: Tabachnyk, M., Ehrler, B., Bayliss, S., Friend, R. H., and Greenham, N. C.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Physics Letters
Publisher:AIP Publishing
ISSN (Online):1077-3118
Published Online:08 October 2013
Copyright Holders:Copyright © 2013 The Authors
First Published:First published in Applied Physics Letters: 103(15): 153302
Publisher Policy:Reproduced under a Creative Commons License

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