A facile approach to alleviate photochemical degradation in high efficiency polymer solar cells

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Journal Article
Journal of Materials Chemistry A, 2015, 3 (31), pp. 16313 - 16319
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© The Royal Society of Chemistry 2015. In this paper, it is found that residual 1,8-diiodoctane (DIO) which is used as a solvent additive in the manufacture of high-performance polymer solar cells accelerates chemical degradation of the donor polymer PBDTTT-EFT under light and air exposure especially in its blend with PC71BM. Here we report an anti-solvent treatment which can significantly improve device stability while maintaining a device efficiency of ∼ 9%. The morphological changes after anti-solvent treatment are also investigated by a combination of synchrotron based techniques.
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