Abstract
Here, we report a facile molecular engineering approach with alkylthio and fluorine atom modified the conjugated side chain of quinoxaline-based polymer, namely DTFFQx-TS, which afforded lower highest occupied molecular orbital energy level and enhanced interchain interactions. The conventional devices based on DTFFQx-TS:ITIC exhibited the power conversion efficiency (PCE) of 5.26% with a remarkably high open circuit voltage (Voc) of 0.99 V. This work not only provides a newly efficient candidate of quinoxaline acceptor block modified with fluorinated conjugated side chain, but also achieves high Voc copolymers for polymer solar cells via the synergistic effect of fluorination and side chain engineering strategies.
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