Improved photovoltaic performance of 2,7-pyrene based small molecules via the use of 3-carbazole as terminal unit

To study the influence of 3-carbazole terminal group on photovoltaic performance in SM-OSCs, small molecules of Py-2DTBT with an A-Ar-A type and Py-2DTBTCz with an Ar(A-D)2 framework were obtained. Compared to Py-2DTBT, Py-2DTBTCz exhibited significantly increased Jsc and FF, as well as a much higher PCE in their corresponding OPV devices.233