NIR absorbing D–π–A–π–D structured diketopyrrolopyrrole–dithiafulvalene based small molecule for solution processed organic solar cells

Abstract

A new low band gap small molecule DPP–DTF with a D–π–A–π–D molecular structure composed of a dithiafulvalene (DTF) donor and a diketopyrrolopyrrole (DPP) acceptor was synthesized and tested for organic solar cells. Using the DPP–DTF small molecule as an electron donor, and PC₇₁BM as an acceptor a high power conversion efficiency (PCE) of 4.3% was achieved.