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TEM image of as-cast 88 (a) and SVA-treated (b) 9:PC71BM thin films (Scale bar is 100 nm). (c) Current−voltage characteristics under illumination and (d) IPCE spectra of the OSCs base on as-cast and SVA-treated 9:PC71BM active layers. Reproduced from Ref. [39] with permission from 2018 American Chemical Society.
