逐层沉积型有机太阳能电池的研究进展

Research Progress of Layer-by-layer Deposited Organic Solar Cells

近30年来,基于给/受体材料的本体异质结被认为是有机光伏器件最理想的器件结构.优化有源层中给/受体互穿网络结构,提高激子解离和载流子传输效率是提高本体异质结有机光伏器件性能的有效途径.近年来,给/受体逐层沉积的分层异质结有机光伏器件得到了快速发展,其光电转化效率可与本体异质结有机光伏器件的效率相媲美,这说明有机光伏器件领域诸多科学问题还有待深入研究.本文从工作机理、优化策略以及大面积制作潜力等方面,综合评述分层异质结有机光伏器件的代表性成果,重点阐述掺入添加剂、热处理及多元策略等在提高器件性能方面发挥的关键作用,讨论分层异质结有机光伏器件的现存问题,并展望了其发展趋势.

In the recent 30 years,donor and acceptor materials mixed bulk heterojunction(BHJ)are considered to be the most ideal device structure of organic photovoltaics(OPVs).The efficiency of exciton dissociation and charge transport can be improved by optimizing the donor-acceptor interpenetrating network structure in the active layer,which should be an effective way to improve the performance of BHJ OPVs.The layer-by-layer(LbL)OPVs are constructed by sequentially depositing donor and acceptor,which have been developed rapidly in recent years.The power conversion efficiency(PCE)of LbL OPVs can be comparable with that of BHJ OPVs,indicating that many scientific issues need to be further studied in OPVs.This review summarizes the representative achievements of LbL OPVs from the working mechanism,optimization strategy and large-area production potential.The key roles of additives,annealing treatment and multi-component strategy in improving device performance are emphasized.The problems existing in LbL OPVs are discussed,and the future prospects of LbL OPVs are outlooked.