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Indexed by:期刊论文

Date of Publication:2019-05-01

Journal:Journal of Energy Chemistry

Included Journals:EI

Volume:32

Page Number:152-158

ISSN No.:20954956

Key Words:Carbon; Hole mobility; Perovskite; Perovskite solar cells, Charge recombinations; Dispiro; Hole-transporting materials; Photovoltaic; Photovoltaic performance; Power conversion efficiencies; Small variations; Two-materials, Solar cells

Abstract: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 carbon–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. © 2018 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences