Synthesis of a polythieno[3,4-b]thiophene derivative with a low-lying HOMO level and its application in polymer solar cells

摘要

A planar benzodithiophene with lower HOMO was copolymerized with the thieno[3,4-b]thiophene unit to obtain a new low band gap polymer of PBDPTT-C, which exhibited a higher open-circuit voltage (Foc) of 0.8 V and a promising efficiency of 5.2%. In recent years, tremendous developments in polymer solar cells (PSCs) intrigue more researchers to focus on studying new conjugated polymer materials. The design and preparation of low band gap (LBG) conjugated polymer donor materials has been proved to be an effective approach to realize high power conversion efficiencies (PCEs) for the PSCs.