A high-performance photovoltaic small molecule developed by modifying the chemical structure and optimizing the morphology of the active layer

Abstract

A small molecule (DR3TDOBDT) containing 4,8-dioctyl benzo[1,2-b:4,5-b′]dithiophene as the central block and 3-(2-ethylhexyl)-rhodanine as the end-capping groups has been designed and synthesized. A power conversion efficiency of 8.26% was achieved through the active layer morphology optimization process combining thermal annealing and solvent vapor annealing.