Low band gap dithieno[3,2-b:2',3'-d]silole-containing polymers, synthesis, characterization and photovoltaic application

摘要

A series of low band gap silole-containing polymers were synthesized with different alkyl side chains and a power conversion efficiency (PCE) of 3.43% was obtained.rnIn the past two years, tremendous developments in polymer solar cells (PSCs) have intrigued researchers to study new conjugated polymer materials, to optimize polymer morphology, and to investigate various physical device structures to promote higher power conversion efficiencies (PCE). Among the various types of organic photovoltaic devices investigated so far, bulk-heterojunction solar cells, which are composed of an interpenetrating network of donors and acceptors, have played a leading role in realizing higher efficiencies. Until now, efficiencies up to 4-5% have been achieved from poly(3-hexylthiophene) (P3HT) as the donor and a soluble fullerene derivative (C_(61)-PCBM) as the acceptor.