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)

Abstract

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
• Status: Published
• Refereed: Yes
• 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: 0003-6951
• 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