降低非富勒烯有机太阳能电池能量损失的机制和策略

Mechanisms and Strategies to Reduce Energy Loss in Non-fullerene Organic Solar Cells

在过去20年,溶液加工制备本体异质结有机太阳能电池(BHJ-OSCs)发展迅速,其能量转换效率(PCE)已经超过19%,但器件的能量损失(E_(loss ))相对较大,成为限制其光伏性能的瓶颈因素。因此,通过降低能量损失进一步提高OSCs的PCE成为该领域的研究重点。通过对OSCs中光物理过程的分析,讨论了不同能量损失途径的机理,综述了以下四种策略:(1)减小给受体间的能级差,(2)降低能量无序度,(3)提高器件的发光效率,(4)减小重组能。本文系统总结了降低非富勒烯OSCs体系E_(loss )的最新进展,为进一步提高该类器件性能提供重要参考。

In the past two decades,solution-processed bulk heterojunction organic solar cells(BHJ-OSCs)have developed rapidly,and their power conversion efficiency(PCE)has exceeded 19%,but the relatively large energy loss(Eloss)of the devices has become a bottleneck factor limiting their photovoltaic performance.Therefore,further improving the PCE of OSCs by reducing the energy loss has become the focus of research in this field.By analyzing the photophysical processes in OSCs,the mechanisms of different energy loss pathways are discussed,and the following four strategies are reviewed:(1)reducing the energy offset between donors and acceptors,(2)reducing the energy disorder,(3)improving the luminescence efficiency of the devices,and(4)reducing the reorganization energy.This paper systematically summarizes the recent progress in reducing the E_(loss)of non-fullerene OSCs systems,which provides an important reference for further improvement of the performance of such devices.