Synthesis of small molecule acceptor containing rhodanine for organic solar cells

Abstract

Non-fullerene acceptor (NFA) materials recently have attracted a lot of attention due to their significant advantages including tunability of energy levels, band gap, planarity and light absorption ability compared with fullerene-derivative acceptors. Thus NFA based organic solar cells (OSC) have achieved remarkable power conversion efficiency up to 14%. Here, we synthesized small molecules acceptor materials (IRDCN) containing isoindigo and rhodanine-(CN)2 for OSC. Isoindigo and rhodanine-CN2 are dye materials, which can extend the light absorption in visible range and have high absorption coefficient. Furthermore, isoindigo have deep highest occupied molecular orbital (HOMO) energy level, consequently enhancing the oxidation stability. We fabricated the (IRDCN) based OSC and compared with fullerene based OSC and investigated their absorption, blending flim morphology, and their J-V characteristics.