掺杂剂
钙钛矿(结构)
材料科学
对偶(语法数字)
纳米技术
兴奋剂
化学
光电子学
结晶学
艺术
文学类
作者
Gang Xie,Jing Wang,Shungao Yin,Aihui Liang,Wei Wang,Ziming Chen,Chuizheng Feng,Jie‐Hui Yu,Xunfan Liao,Qifan Xue,Yuang Fu,Yong Min,Xinhui Lu,Yiwang Chen
标识
DOI:10.1002/ange.202403083
摘要
Dopant‐free hole transport materials (HTMs) are ideal materials for highly efficient and stable n‐i‐p perovskite solar cells (PSCs), but most current design strategies for tailoring the molecular structures of HTMs are limited to single strategy. Herein, four HTMs based on dithienothiophenepyrrole (DTTP) core are devised through dual‐strategy methods combining conjugate engineering and side chain engineering. DTTP‐ThSO with ester alkyl chain that can form six‐membered ring by the S···O noncovalent conformation lock with thiophene in the backbone shows good planarity, high‐quality film, matching energy level and high hole mobility, as well as strong defect passivation ability. Consequently, a remarkable power conversion efficiency (PCE) of 23.3% with a nice long‐term stability is achieved by dopant‐free DTTP‐ThSO‐based PSCs, representing one of the highest values for un‐doped organic HTMs based PSCs. Especially, the fill factor (FF) of 82.3% is the highest value for dopant‐free small molecular HTMs‐based n‐i‐p PSCs to date. Moreover, DTTP‐ThSO‐based devices have achieved an excellent PCE of 20.9% in large‐area (1.01 cm2) devices. This work clearly elucidates the structure‐performance relationships of HTMs and offers a practical dual‐strategy approach to designing dopant‐free HTMs for high‐performance PSCs.
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