Quinoxalineimide as a Novel Electron-accepting Building Block for Organic Optoelectronics

Abstract Organic semiconductors with a donor–acceptor–donor architecture based on the novel acceptor unit of quinoxalineimide (QI) were designed and synthesized. They absorbed wider wavelength light compared to PC61BM, and functioned as acceptor materials for solution-processed bulk-heterojunction organic photovoltaic devices. In addition, the relatively shallow LUMO levels, due to the electron-withdrawing pyrazine and imide groups of the QI unit, resulted in a high open-circuit voltage of the devices.