Small-molecule acceptors based on 4H-cyclopenta[1,2-b:5,4-b′]dithiophene units with near-infrared absorption for nonfullerene polymer solar cells
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Highlights•Two small-molecule acceptors 1CIC and 2CIC based on CPDT units and 1,1-dicyanomethylene-3-indanone were synthesized.•Compared with 1CIC, 2CIC exhibited stronger NIR absorption, higher HOMO and LUMO energy levels, and higher electron mobility.•Nonfullerene solar cell based on PTB7-Th:2CIC gave a PCE of 3.53%, with a Jsc of 10.97 mA/cm2.

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