PTB7-Th-Based Organic Photovoltaic Cells with a High of over 1.0 V Fluorination and Side Chain Engineering of Benzotriazole-Containing Nonfullerene Acceptors.

is considered one of the most classic donor polymers for organic photovoltaic (OPV) cells. However, the power conversion efficiency (PCE) of -based OPV is lagging behind that of other promising polymers mainly because of the relatively low open-circuit voltage (). To increase the and PCE of -based OPV, the development of nonfullerene acceptors (NFAs) and studies of structure-property-performance relationship are vital.