钙钛矿(结构)
掺杂剂
材料科学
接受者
聚合物
聚合物太阳能电池
开路电压
兴奋剂
纳米技术
化学工程
光电子学
电压
复合材料
电气工程
物理
凝聚态物理
工程类
作者
Qiang Fu,Huan Liu,Shitong Li,Tong Zhou,Mingqian Chen,Yang Yang,Jian Wang,Rui Wang,Yongsheng Chen,Yongsheng Liu
标识
DOI:10.1002/ange.202210356
摘要
Abstract The dominant hole transport material (HTM) in state‐of‐the‐art perovskite solar cells (PSCs) is Spiro‐OMeTAD, which needs to be doped using hydrophilic dopants to improve its hole mobility and conductivity, resulting in inferior device stability. Here, we propose an effective molecular design strategy to construct dopant‐free polymer HTMs by selecting four structurally related polymers and investigating their structure–property relationship. It is found that the donor and acceptor units with longitudinal conjugate extension, such as BDT‐T and BDD, could not only enhance the planarity of the conjugated polymer backbone and tune the energy levels but also promote the face‐on orientation, resulting in superior charge extraction and transport. The optimized device utilizing dopant‐free polymer HTM shows a high open‐circuit voltage of 1.19 V and a champion efficiency of 24.04 % with greatly improved operational stability, making it among the best performance PSCs based on dopant‐free HTMs.
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