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A narrow-band-gap polymer acceptor (P A ), namely PYT, is reported, while a series of PYT polymer acceptors with controlled average molecular weight (M n ) values were synthesized for fine-tuning the molecular crystallinity and miscibility. When fabricated into all-PSCs with a polymer donor (P D ) PM6, we observed a clear M n dependence on device performance. The PM6:PYT M device gives a record-high PCE of 13.44% for the all-PSCs, resulting from the good P D -P A pair miscibility, suitable blend microstructure, and improved charge transport properties.

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A series of semiconducting copolymers (PTAT-x) containing extended π-conjugated tetrathienoanthracene units have been synthesized. It was shown that the extended conjugation system enhanced the π-π stacking in the polymer/PC(61)BM blend films and facilitated the charge transport in heterojunction solar cell devices. After structural fine-tuning, the polymer with bulky 2-butyloctyl side chains (PTAT-3) exhibited a PCE of 5.6% when it was blended with PC(61)BM.

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