混溶性
三元运算
接受者
能量转换效率
活动层
有机太阳能电池
材料科学
表面能
化学工程
图层(电子)
光电子学
化学物理
化学
物理
纳米技术
计算机科学
聚合物
复合材料
程序设计语言
薄膜晶体管
工程类
凝聚态物理
作者
Jie Lv,Qianguang Yang,Wanyuan Deng,Haiyan Chen,Manish Kumar,Fuqing Zhao,Shirong Lu,Hanlin Hu,Zhipeng Kan
标识
DOI:10.1016/j.cej.2023.142822
摘要
The donor–acceptor miscibility is one of the most critical factors in controlling the active layer morphologies with multiple components. However, how to practically select the third component with the desired miscibility for efficient ternary organic solar cells remains unresolved. Herein, we demonstrate that the surface energy of thin films could be manipulated by altering the weight ratios of the isomeric acceptors in the blend films and, therefore, the regulation of donor–acceptor miscibility. When the acceptor weight ratio (M−Cl:O-Cl) is 1:0.3, low miscibility (χ = 5.43 × 10-2K) with PM6 is achieved, and the power conversion efficiency of organic solar cells composed of PM6:M−Cl (17.1%) is enhanced to 18.1% (PM6:M−Cl:O-Cl). The increased power conversion efficiency resulted from the surface energy-driven active layer morphology and donor–acceptor phase separations, associated with the significantly lower energetic disorder, trap density, and thus reduced free charge recombination. Our findings underline the significance of the isomeric approach to managing the blend film surface energy and, therefore, the donor–acceptor miscibility for improving the device performance, providing guidelines for the fabrication of high-performed ternary OSCs and material designs.
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