Abstract
Three new copolymer donors based on DCN-alt FTAZ PT-68, PT-810-H, and PT-810-L were synthesized by adjusting the alkyl chains and molecular weight. The copolymers showed deep highest occupied molecular orbital (HOMO) levels of about −5.50 eV due to introducing fluorine atoms and cyano electron-withdrawing groups. Therefore, devices based on the copolymers as donors and ITIC as acceptors had high open-circuit voltages (VOC) exceeding 1.00 V. Due to a dicyanodistyrylbenzene (DCN) unit providing rigid and extended conjugation and reducing the backbone torsion, the blended films had high hole mobility values of about 2.50 × 10−3 cm2 V−1 s−1. Devices with the PT-810: ITIC blended film had the highest power conversion efficiency (PCE) of 7.03%, with an open-circuit voltage of 1.04 V, a short-circuit current density of 12.25 mA/cm2, and a fill factor of 55%. These results provide guidance for the design of high-efficiency photovoltaic materials.
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