Bithiophene-based cost-effective hole transport materials for efficient n-i-p perovskite solar cells  

作　　者：Lang Li Lingfang Zheng Wei Gao Jinyan Zeng Siwei Hao Xinjing Zhao Yangyang Dang Liqiang Xie Zhanhua Wei 

机构地区：[1]Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing,Institute of Luminescent Materials and Information Displays,College of Materials Science and Engineering,Huaqiao University,Xiamen 361021,China [2]School of Physics and Physical Engineering,Qufu Normal University,Qufu 273165,China

出　　处：《Energy Materials and Devices》2024年第2期18-28,共11页能源材料与器件（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.U23A20371,U21A2078,and 22179042);the Natural Science Foundation of Fujian Province(Grant No.2023J06034);the Natural Science Foundation of Xiamen,China(Grant No.3502Z20227036);the Scientific Research Funds of Huaqiao University(Grant No.605-50Y23024).

摘　　要：Charge transport materials constitute a relatively large portion of the cost in the production of perovskite solar cells(PSCs).Therefore,developing cheap and efficient charge transport materials is of great significance for the commercialization of PSCs.In this study,three low-cost hole transport materials(HTMs),specifically 4,4'-(3,3'-bis(4-methoxy-2,6-dimethylphenyl)-[2,2'-bithiophene]-5,5'-diyl)bis(N,N-bis(4-methoxyphenyl)aniline)(TP-H),4,4'-(3,3'-bis(4-methoxy-2,6-dimethylphenyl)-[2,2'-bithiophene]-5,5'-diyl)bis(3-methoxy-N,N-bis(4-methoxy-phenyl)aniline)(TP-OMe),and 4,4'-(3,3'-bis(4-methoxy-2,6-dimethylphenyl)-[2,2'-bithiophene]-5,5'-diyl)bis(3-fluoro-N,N-bis(4-methoxyphenyl)aniline)(TP-F),were designed and synthesized using a bulky group-substi-tuted 2,2'-bithiophene core and methoxy-or F-functionalized triphenylamine derivatives.Compared to the HTMs without F atoms,TP-F using F substitution exhibited enhanced intermolecular packing,a lower highest occupied molecular orbital energy level,and increased hole mobility and conductivity.The PSC incorporating the doped TP-F as the hole transport layer achieved the highest power conversion efficiency(over 24%)among the three devices.The high performance of TP-F can be attributed to the passivation effect of S and F atoms on uncoordinated Pb2+within the perovskite(PVSK)film,which significantly reduces the density of defect states and the incidence of trap-mediated recombination in PSCs.This study demonstrates the effec-tiveness of the 3,3'-bis(4-methoxy-2,6-dimethylphenyl)-2,2'-bithiophene building block for constructing cost-effective HTMs and highlights the impact of F substitution on enhancing the photovoltaic performance of PSCs.

关 键 词：perovskite solar cells hole transport material low cost passivation effect 

分 类 号：O62[理学—有机化学]