高分子太陽電池の新展開

Abstract

Polymer solar cells have attracted increasing attention recently because they are lightweight, flexible, and colorful, and in addition, are suitable for high-throughput production by printing techniques. In this review, we will describe recent progress in polymer solar cells in terms of photovoltaic conversion mechanism and efficiency. As for the photovoltaic conversion mechanism, recent studies have shown that an energy offset in the HOMO or LUMO level would be not necessary for excitons to be dissociated into free charge carriers in polymer solar cells. This is one of the hottest topics in this community. As for the photovoltaic performance, ternary blends and non-fullerene acceptors have a great impact on the improvement in power conversion efficiency. As a result, the efficiency has exceeded 17％ for tandem polymer solar cells based on non-fullerene ternary and binary blends. We also mention the future direction of polymer solar cells.