New strategy for improving the perovskite solar cells' open-circuit voltage: Cation substitution of hole transport layer

文献类型： 外文期刊

第一作者： Wang, Xinshou

作者： Wang, Xinshou;Liu, Jialei;Wang, Xinshou;Kou, Dongxing;Ouyang, Canbin

作者机构：

关键词： Gallium; Perovskite; Semiconductor; Inorganic hole-transport material; Optic-electronic conversion

期刊名称：OPTICAL MATERIALS （ 影响因子：3.08； 五年影响因子：2.763 ）

ISSN： 0925-3467

年卷期： 2021 年 121 卷

页码：

收录情况： SCI

摘要： It has been proven that both recombination and band gap difference are the key issues responsible for Voc enhancement, and a wide band gap inorganic hole-transporting material (HTM) is more favorable for efficient perovskite solar cells. Herein, we employed the wide band gap CuGaS2 (CGS) quantum dots (QDs) as HTM. And such quantum dots were used in novel solar cells based on perovskite materials though the method of cation substitution. Through substitution of indium element with gallium element, band gap of the QDs was changed greatly (from 1.56 eV to 2.29 eV). The processes of charge transfer and the alignment of band level were studied in details and the result indicates that the increase of conduction band level for CGS with wide band gap led to a dramatic increase in Voc. And the cell efficiency was finally improved from 10.46% to 12.78%.

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