Chlorine-Substituent Regulation in Dopant-Free Small-Molecule Hole-Transport Materials Improves the Effi ciency and Stability of Inverted Perovskite Solar Cells  

作　　者：Xinyi Liu Xiaoye Zhang Zhanfeng Li Jinbo Chen Yanting Tian Baoyou Liu Changfeng Si Gang Yue Hua Dong Zhaoxin Wu 

机构地区：[1]Key Laboratory of Advanced Transducers and Intelligent Control System,Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,China [2]School of Electrical Engineering,University of South China,Hengyang 421001,China [3]College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan 030024,China [4]Ningxia Hui Autonomous Region Screen Display Organic Materials Engineering Technology Research Center,Ningxia Sinostar Display Material Co.,Ltd.,Yinchuan 750003,China [5]Organic Semiconductor Centre,EaStCHEM School of Chemistry,University of St Andrews,Fife KY169ST,UK [6]Key Laboratory of Photonics Technology for Information School of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Transactions of Tianjin University》2024年第4期314-323,共10页天津大学学报（英文版）

基　　金：This study was supported by the National Nat-ural Science Foundation of China(No.22379105);the Natural Sci-ence Foundation of Shanxi Province(Nos.20210302123110 and 202303021211059);the Open Fund Project of Ningxia Sinostar Display Material Co.,Ltd.

摘　　要：Although doped hole-transport materials(HTMs)off er an effi ciency benefi t for perovskite solar cells(PSCs),they inevi-tably diminish the stability.Here,we describe the use of various chlorinated small molecules,specifi cally fl uorenone-triphenylamine(FO-TPA)-x-Cl[x=para,meta,and ortho(p,m,and o)],with diff erent chlorine-substituent positions,as dopant-free HTMs for PSCs.These chlorinated molecules feature a symmetrical donor-acceptor-donor structure and ideal intramolecular charge transfer properties,allowing for self-doping and the establishment of built-in potentials for improving charge extraction.Highly effi cient hole-transfer interfaces are constructed between perovskites and these HTMs by strategi-cally modifying the chlorine substitution.Thus,the chlorinated HTM-derived inverted PSCs exhibited superior effi ciencies and air stabilities.Importantly,the dopant-free HTM FO-TPA-o-Cl not only attains a power conversion effi ciency of 20.82% but also demonstrates exceptional stability,retaining 93.8%of its initial effi ciency even after a 30-day aging test conducted under ambient air conditions in PSCs without encapsulation.These fi ndings underscore the critical role of chlorine-substituent regulation in HTMs in ensuring the formation and maintenance of effi cient and stable PSCs.

关 键 词：Hole-transport materials Inverted perovskite solar cells Chlorinated small molecules Donor–acceptor–donor structure 

分 类 号：TB34[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]