Abstract
A new wide bandgap (WBG) conjugated polymer diO-PBDB-T containing alkoxy substituted thiophene spacer was designed and synthesized for application as a donor in nonfullerene acceptor (NFA) based polymer solar cells (PSCs), to investigate the effect of alkoxy substitution on the photovoltaic performance. The suggested polymer diO-PBDB-T showed good complementary absorption spectra with a bandgap of 1.96 eV, a highest occupied molecular orbital (HOMO) energy level of −5.4 eV. The diO-PBDB-T:Y6-based PSCs exhibit a much higher power conversion efficiency (PCE) of 4.26%. These results suggest that alkoxy substitution is an effective strategy to improve the optoelectronic properties of WBG polymers in NFA-PSCs.
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