文献类型：期刊文献

英文题名：A Coplanar π-Extended Quinoxaline Based Hole-Transporting Material Enabling over 21 % Efficiency for Dopant-Free Perovskite Solar Cells

作者：Guo, Huanxin[1];Zhang, Hao[1];Shen, Chao[1];Zhang, Diwei[1];Liu, Shuaijun[1];Wu, Yongzhen[1];Zhu, Wei-Hong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn,Shanghai Key Lab Funct Mat Ch, Inst Fine Chem,Frontiers Sci Ctr Mat & Dynam Chem, Key Lab Adv Mat & Joint Int Res Lab Precis Chem &, Shanghai 200237, Peoples R China

年份：2021

卷号：60

期号：5

起止页码：2674

外文期刊名：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录：;EI(收录号：20204909571151);WOS:【SCI-EXPANDED(收录号:WOS:000594741900001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (21822504, 21706070, and 21421004), Shanghai Municipal Science and Technology Major Project (2018SHZDZX03), Program of Introducing Talents of Discipline to Universities (B16017), Eastern Scholar (TP2016018), China Association of Science and Technology (2017QNRC001).

语种：英文

外文关键词：dopant-free; hole-transporting materials; perovskite solar cells; quinoxaline; π – π stacking

摘要：Developing dopant-free hole transporting materials (HTMs) is of vital importance for addressing the notorious stability issue of perovskite solar cells (PSCs). However, efficient dopant-free HTMs are scarce. Herein, we improve the performance of dopant-free HTMs featuring with a quinoxaline core via rational pi-extension. Upon incorporating rotatable or chemically fixed thienyl substitutes on the pyrazine ring, the resulting molecular HTMs TQ3 and TQ4 show completely different molecular arrangement as well as charge transporting capabilities. Comparing with TQ3, the coplanar pi-extended quinoxaline based TQ4 endows enriched intermolecular interactions and stronger pi-pi stacking, thus achieving a higher hole mobility of 2.08x10(-4) cm(2) V-1 s(-1). It also shows matched energy levels and high thermal stability for application in PSCs. Planar n-i-p structured PSCs employing dopant-free TQ4 as HTM exhibits power conversion efficiency (PCE) over 21 % with excellent long-term stability.