Synthesis and photovoltaic properties of two-dimensional conjugated polymers with tunable pendant acceptor groups

Abstract

We have designed and synthesized a series of two-dimensional conjugated polymers (P1P4) based on a backbone consisting of a BDT donor unit and a thiophene unit, which was grafted with different acceptor groups. These polymers show good solubility, thermal stability, and tunable optical and electrochemical properties. Bulk heterojunction polymer solar cells based on P2 exhibit a PCE of 1.89% and an impressively high Voc of 0.93V. Further efforts to lower the bandgaps of these polymers with the aim to enhance photocurrent are currently ongoing. © 2013 The Society of Polymer Science, Japan (SPSJ) All rights reserved.