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陈永胜课题组 | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

发布人:    发布时间:2022/04/29   浏览次数:

Pyrene-Based Dopant-Free Hole-Transport Polymers with Fluorine-Induced Favorable Molecular Stacking Enable Efficient Perovskite Solar Cells

By:

Yao, ZY (Yao, Zhaoyang) [1] , [2] ; Zhang, FG (Zhang, Fuguo) [2] ; He, LL (He, Lanlan) [3] ; Bi, XQ (Bi, Xingqi) [1] ; Guo, YX (Guo, Yaxiao) [2] , [4] ; Guo, Y (Guo, Yu) [5] ; Wang, LQ (Wang, Linqin) [5] ; Wan, XJ (Wan, Xiangjian) [1] ; Chen, YS (Chen, Yongsheng) [1] ; Sun, LC (Sun, Licheng) [2] , [5]


DOI

10.1002/anie.202201847

Abstract

A new class of polymeric hole-transport materials (HTMs) are explored by inserting a two-dimensionally conjugated fluoro-substituted pyrene into thiophene and selenophene polymeric chains. The broad conjugated plane of pyrene and "Lewis soft" selenium atoms not only enhance the pi-pi stacking of HTM molecules greatly but also render a strong interaction with the perovskite surface, leading to an efficient charge transport/transfer in both the HTM layer and the perovskite/HTM interface. Note that fluorine substitution adjacent to pyrene boosts the stacking of HTMs towards a more favorable face-on orientation, further facilitating the efficient charge transport. As a result, perovskite solar cells (PSCs) employing PE10 as dopant-free HTM afford an excellent efficiency of 22.3 % and the dramatically enhanced device longevity, qualifying it among the best PSCs based on dopant-free HTMs.