Synthesis of π-Extended Low Bandgap Polymer Based on Isoindigo and Thienylvinylene for High-Performance Polymer Solar Cells

摘要

The strong needs to develop high performance polymer solar cells (PSCs) as renewable and eco-friendly energy resource make significant progress in the power conversion efficiency (PCE) of PSCs over past few decades. The advance in PSC performance has been contributed mainly by the evolution of new donor polymers which have low optical bandgap for harvesting broad solar spectrum, proper lowest unoccupied molecular orbital (LUMO) energy level to secure exciton dissociation at the donor-acceptor interface, deep highest occupied molecular orbital (HOMO) energy level to achieve high open-circuit voltage (V_(OC)), and high hole mobility for balanced charge collection into both electrodes. One of the best strategies to accomplish the desired properties is to synthesize alternating copolymers, as electron donor materials in bulk heterojunction, consisting of electron-rich and electron-deficient monomers.