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Issue 3, 2014
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Towards optimisation of photocurrent from fullerene excitons in organic solar cells

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Abstract

Photocurrent from fullerene excitons in polymer–fullerene solar cells is optimised by employing a series of low bandgap diketopyrrolopyrrole-containing polymers with differing molecular weights. The low LUMO level of this donor polymer prevents efficient charge generation from polymer excitons, allowing us to focus on charge and photocurrent generation specifically from fullerene excitons. We employ femtosecond transient absorption spectroscopy and transmission electron microscopy to show a correlation between fullerene domain size and the kinetics of polaron generation from fullerene excitons, and relate these observations to device efficiency. Charge generation from fullerene excitons is shown to occur on the 0.5 ns timescale, limited by the kinetics of diffusion of fullerene excitons to domain interfaces with donor polymers. For devices employing the highest molecular weight donor polymer, ∼7 mA cm−2 of photocurrent is observed from fullerene excitons, leading to an overall device efficiency of 5.2%.

Graphical abstract: Towards optimisation of photocurrent from fullerene excitons in organic solar cells

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Supplementary files

Article information


Submitted
01 Aug 2013
Accepted
18 Dec 2013
First published
19 Dec 2013

Energy Environ. Sci., 2014,7, 1037-1043
Article type
Paper

Towards optimisation of photocurrent from fullerene excitons in organic solar cells

S. D. Dimitrov, Z. Huang, F. Deledalle, C. B. Nielsen, B. C. Schroeder, R. S. Ashraf, S. Shoaee, I. McCulloch and J. R. Durrant, Energy Environ. Sci., 2014, 7, 1037
DOI: 10.1039/C3EE42607F

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