材料科学
结晶度
侧链
三元运算
接受者
位阻效应
电荷(物理)
光电子学
开路电压
聚合物太阳能电池
载流子
萃取(化学)
重组
化学物理
有机太阳能电池
聚合物
能量转换效率
化学工程
电压
有机化学
化学
复合材料
工程类
程序设计语言
物理
基因
量子力学
生物化学
计算机科学
凝聚态物理
作者
Kaien Chong,Xiaopeng Xu,Huifeng Meng,Jingwei Xue,Liyang Yu,Wei Ma,Qiang Peng
标识
DOI:10.1002/adma.202109516
摘要
Improving charge extraction and suppressing charge recombination are critically important to minimize the loss of absorbed photons and improve the device performance of polymer solar cells (PSCs). In this work, highly efficient PSCs are demonstrated by progressively improving the charge extraction and suppressing the charge recombination through the combination of side-chain engineering of new nonfullerene acceptors (NFAs), adopting ternary blends, and introducing volatilizable solid additives. The 2D side chains on BTP-Th induce a certain steric hindrance for molecular packing and phase separation, which is mitigated by fluorination of side chains on BTP-FTh. Moreover, by introducing two highly crystalline molecules as the second acceptor and volatilizable solid additive, respectively, into the BTP-FTh-based host blend, the molecular crystallinity is significantly improved and the blend morphology is finely optimized. As expected, enhanced charge extraction and suppressed charge recombination are progressively realized, contributing to the largely improved fill factor (FF) of the resultant devices. Accompanied by the enhanced open-circuit voltage (Voc ) and short-circuit current density (Jsc ), a record high power conversion efficiency (PCE) of 19.05% is realized finally.
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