This work developed three thiophene[3,4-b]thiophene-based polymer acceptors using polymerized small-molecule acceptor strategy. The thiophene π-bridge integration and optimized side-chains enhanced the device performance. PM6:PYF-EF binary devices achieved 17.07% PCE, which further reached 18.62% in PM6:PY-IT:PYF-EF ternary blends.
C. Liao, H. Wang, M. Deng, X. Xu and Q. Peng, Chem. Commun., 2025, Accepted Manuscript , DOI: 10.1039/D5CC01657F
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