2D Side‐Chain Engineered Asymmetric Acceptors Enabling Over 14% Efficiency and 75% Fill Factor Stable Organic Solar Cells
作者:Jinru Cao、Hongtao Wang、Shenya Qu、Jiangsheng Yu、Linqiang Yang、Zhuohan Zhang、Fuqiang Du、Weihua Tang
DOI:10.1002/adfm.202006141
日期:2020.12
conversion efficiency (PCE) of 14.02% with a fill factor (FF) of 75.06%, outperforming PBDB‐T devices with IPT2F‐Th (12.52%, 71.20%), IPT2F‐Ph (13.13%, 72.11%), and octylated IPT‐2F (13.70%, 71.50%). The PCE over 14% and FF over 75% are among the highest values for 2D FREAs OSCs reported to date. More importantly, outstanding thermal stability and light soaking stability are observed with PCE over 12% maintained
有源层的电荷传输和形态是有机太阳能电池(OSC)中器件性能和稳定性的关键考虑因素。可以通过精心设计的稠环电子受体(FREA)的分子设计,尤其是共轭延伸和侧链工程来微调这些性质。在这项工作中,N在高效的不对称FREA设计中探索了功能化的共轭。来自主链的N共轭侧链的扭曲使三个FREA具有相似的能级和光吸收(约850 nm边缘)。它们与PBDB-T的混合物显示出高的载流子迁移率和有序的相分离。令人兴奋的是,基于IPT2F‐TT的OSC的主电源转换效率(PCE)为14.02%,填充因子(FF)为75.06%,优于IPT2F‐Th(12.52%,71.20%),IPT2F‐Ph的PBDB‐T设备(13.13%,72.11%)和辛基IPT-2F(13.70%,71.50%)。迄今为止,报告的2D FREA OSC的PCE超过14%,FF超过75%。更重要的是,在热老化或光老化100小时后,PCE保持超