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Thin-film characterization. (A) UV-vis absorption spectrum of the pristine PBDTTT-OFT thin film. (B) UV-vis absorption spectrum of the PBDTTT-OFT:PC71BM and PBDTTT-EFT:PC71BM blend films. (C) Two-dimensional GIWAXS images of the pristine PBDTTT-OFT film and the PBDTTT-OFT:PC71BM blend film.
