通过去除水致缺陷提升有机太阳能电池性能

Remove the water-induced traps toward improved performance in organic solar cells

由于水分子簇的电离能较低,在有机共轭材料中,水致缺陷有可能在膜中分子间的空隙形成.这就导致了较差的空穴和电子传输能力,使有机太阳能电池的光伏性能变差.本工作研发了一种溶剂-水蒸发(SWE)策略,该策略可以有效去除光敏层中无处不在的水诱导陷阱,从而显著改善器件性能.与未经处理的PM6:Y6二元体系(15.83%)相比,使用这种SWE方法可实现该体系17.10%的功率转换效率和更好的器件光稳定性.本文还揭示了该策略的独特优势,包括良好的电荷传输和提取特性以及在有机太阳能电池中的良好通用性.此外,我们将该策略应用于有机发光二极管和有机场效应晶体管,证明了该SWE方法的普适性.这一策略为推进有机电子学领域的发展迈出了重要的一步.

Clusters of water molecules have low ionization energies because of stabilization of charge from the dipole moment of surrounding molecules,and thus can form potential traps resulting in the undesirable photovoltaic performance in organic solar cells(OSCs).Herein,we demonstrated a solvent-water evaporation(SWE)strategy,which can effectively remove the water-induced traps that are omnipresent in photoactive layers,leading to a significant improvement in device performance.A higher power conversion efficiency of 17.10%and a better device photostability are achieved by using this SWE method,as compared with the untreated binary PM6:Y6 system(15.83%).We highlight the water-related traps as a limiting factor for carrier transport and extraction properties,and further reveal the good universality of the SWE strategy applied into OSCs.In addition,organic light-emitting diodes and organic field-effect transistors are investigated to demonstrate the applicability of this SWE approach.This strategy presents a major step forward for advancing the field of organic electronics.