A systematic approach involving conjugation extension and end group chlorination is capable of enhancing both J SC and PCE. Overall, the PM6:DTTC-4Cl-based device delivers a remarkable PCE of 15.42% with a V OC of 0.92 V, a J SC of 22.64 mA cm −2 and an FF of 74.04%.
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Chen et al. (2019) studied this question.
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