High isotropic dispiro structure hole transporting materials for planar perovskite solar cells

查看全文 作　　者：Bin [1]Cai;Xichuan [1]Yang;Haoxin [1]Wang;Weihan [1]Wang;Jincheng [1]An;Licheng [1,2]Sun 机构地区：[1]State Key Laboratory of Fine Chemicals,Institute of Artificial Photosynthesis,DUT-KTH Joint Education and Research Center on Molecular Devices,Dalian University of Technology (DUT),Dalian 116024,Liaoning,China;[2]Department of Chemistry,School of Chemical Science and Engineering,KTH Royal Institute of Technology,10044 Stockholm,Sweden 出　　处：《Journal of Energy Chemistry》索引2019年第28卷第5期,共7页 基　　金：the National Natural Science Foundation of China(Nos.51661135021,21606039,21507008,91233201,and 21276044)for financial support 摘　　要：Two novel fluorene-based hole transporting materials (HTMs) were synthesized to be used in perovskite solar cells (PSCs). C102 was designed based on C101 by simply linking the two carb on-carbon single bonds to compose a 'dispiro' structure. Their typically similar structures cause them sharing almost the same energy levels. However, their photovoltaic performances are quite different due to the small variations. The PSC that contained the 'dispiro' structure, C102, reached a power conversion efficiency (PCE) of 17.4%, while the device contained C101, obtained a lower PCE of 15.5%. Electrochemical properties and Photovoltaic characterization of the two materials have been investigated to explain the result. It is shown that C102 has a stronger ability to transport holes and resist the charge recombination. Thus, the dispiro structure should be more appropriate being used as HTM in PSCs. 关 键 词：Dispiro HOLE transporting MATERIALS PLANAR PEROVSKITE solar cells