Absorption spectra of polymer FBT-Th4(1,4) (M n = 46.4 Kg/mol, E g = 1.62 eV, and HOMO = –5.36 eV) indicate strong interchain aggregation ability. High hole mobilities up to 1.92 cm2(V s)–1 are demonstrated in OFETs fabricated under mild conditions. Inverted solar cells with active layer thicknesses ranging from 100 to 440 nm display PCEs exceeding 6.5%, with the highest efficiency of 7.64% achieved with a 230 nm thick active layer.
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