Performance enhancement of fullerene-based solar cells by light processing

Zhe Li, Him Cheng Wong, Zhenggang Huang, Hongliang Zhong, Ching Hong Tan, Wing Chung Tsoi, Ji Seon Kim, James R. Durrant () and João T. Cabral ()
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Zhe Li: Imperial College London
Him Cheng Wong: Imperial College London
Zhenggang Huang: Imperial College London
Hongliang Zhong: Imperial College London
Ching Hong Tan: Imperial College London
Wing Chung Tsoi: Imperial College London
Ji Seon Kim: Imperial College London
James R. Durrant: Imperial College London
João T. Cabral: Imperial College London

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract A key challenge to the commercialization of organic bulk heterojunction solar cells is the achievement of morphological stability, particularly under thermal stress conditions. Here we show that a low-level light exposure processing step during fabrication of blend polymer:PC60BM solar cells can result in a 10-fold increase in device thermal stability and, under certain conditions, enhanced device performance. The enhanced stability is linked to the light-induced oligomerization of PC60BM that effectively hinders their diffusion and crystallization in the blend. We thus suggest that light processing may be a promising, general and cost-effective strategy to optimize fullerene-based solar cell performance. The low level of light exposure required suggests not only that this may be an easily implementable strategy to enhance performance, but also that light-induced PC60BM oligomerization may have inadvertently influenced previous studies of organic solar cell device behaviour.

Date: 2013
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DOI: 10.1038/ncomms3227

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