重组
材料科学
激子
离解(化学)
有机太阳能电池
化学物理
光电子学
工程物理
光化学
原子物理学
物理化学
凝聚态物理
聚合物
物理
遗传学
复合材料
基因
化学
生物
作者
Xinyue Cui,Guangliu Ran,Hao Lü,Yuan Liu,Huanxiang Jiang,Huarui Zhang,Cuihong Li,Yahui Liu,Yi Lin,Zaifei Ma,Wenkai Zhang,Pei Cheng,Zhishan Bo
标识
DOI:10.1002/adfm.202400219
摘要
Abstract The achievement of high performance in organic solar cells (OSCs) is highly dependent on efficient exciton dissociation. However, a comprehensive understanding of the exciton dissociation process under photoexcitation in OSCs remains elusive. Herein, a prototypical system of PM6:Y6 is adopted to explore the exciton dissociation process. An organic semiconductor PCz with distinctive photoexcitation signals from PM6 and Y6 is incorporated as the third component. Femtosecond transient absorption spectroscopy demonstrates clear cascade charge transfer processes in ternary PM6:PCz:Y6 system. These cascade channels contribute to enhancing the efficiency of exciton dissociation. Consequently, the nonradiative recombination energy loss is reduced, resulting in an improved power conversion efficiency (PCE) of OSCs. Furthermore, the reduction of energy loss is verified in different OSCs. When PCz is introduced into the D18:L8‐BO system, a low nonradiative recombination energy loss of 0.175 eV is demonstrated, contributing a PCE of over 19%. This work highlights that the insight of efficient exciton dissociation enables low nonradiative recombination losses for efficient OSCs.
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