Stable perovskite solar cells with efficiency of 22.6%via quinoxaline-based polymeric hole transport material  

作　　者：Chenxing Lu Can Zhu Lei Meng Chenkai Sun Wenbin Lai Shucheng Qin Jinyuan Zhang Wenchao Huang Jiaqi Du Yiyang Wang Yongfang Li 

机构地区：[1]Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing,100190,China [2]School of Chemical Science,University of Chinese Academy of Sciences,Beijing,100049,China [3]College of Chemistry,Green Catalysis Center,Zhengzhou University,Zhengzhou,450001,China [4]Department of Materials Science and Engineering,Monash University,Clayton,VIC,3168,Australia [5]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan,430070,China [6]Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Xianhu Hydrogen Valley,Foshan,528216,China [7]Laboratory of Advanced Optoelectronic Materials,College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou,215123,China

出　　处：《Science China Chemistry》2021年第11期2035-2044,共10页中国科学（化学英文版）

基　　金：supported by the National Key Research and Development Program of China(2019YFA0705900);the National Natural Science Foundation of China(51820105003,21734008,61904181);the Guangdong Major Project of Basic and Applied Basic Research(2019B030302007)。

摘　　要：Poor stability of spiro-OMe TAD hole transport materials(HTMs)with dopant is a major obstacle for the commercialization of perovskite solar cells(pero-SCs).Herein,we demonstrate a series of quinoxaline-based D-A copolymers PBQ5,PBQ6 and PBQ10 as the dopant-free polymer HTMs for high performance pero-SCs.The D-A copolymers are composed of fluorothienyl benzodithiophene(BDTT)as D-unit,difluoroquinoxaline(DFQ)with different side chains as A-unit,and thiophene asπ-bridge,where the side chains on the DFQ unit are bi-alkyl for PBQ5,bi-alkyl-fluorothienyl for PBQ6,and alkoxyl for PBQ10.All the three copolymers are adopted as the dopant-free HTM in the pero-SCs.The planar n-i-p structured pero-SCs based on(FAPb I_(3))_(0.98)(MAPb Br_(3))_(0.02)with PBQ6 HTM demonstrated the high power conversion efficiency(PCE)of 22.6%with Vocof1.13 V and FF of 80.8%,which is benefitted from the suitable energy level and high hole mobility of PBQ6.The PCE of 22.6%is the highest efficiency reported in the n-i-p structured pero-SCs based on dopant-free D-A copolymer HTM.In addition,the peroSCs show significantly enhanced ambient,thermal and light-soaking stability compared with the devices with traditional spiroOMe TAD HTM.

关 键 词：perovskite solar cells hole transport materials D-A copolymer difluoroquinoxaline stability 

分 类 号：TM914.4[电气工程—电力电子与电力传动]