Статья

Tailored Phase Transformation of CsPbI<sub>2</sub>Br Films by Copper(II) Bromide for High-Performance All-Inorganic Perovskite Solar Cells

Kai‐Li WangCollege of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, P.R. ChinaRui WangDepartment of Materials Science and Engineering, University of California, Los Angeles, California 90095, United StatesZhao‐Kui WangDepartment of Materials Science and Engineering, University of California, Los Angeles, California 90095, United StatesMeng LiInstitute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Suzhou, Jiangsu 215123, ChinaYue ZhangInstitute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Suzhou, Jiangsu 215123, ChinaHeng MaCollege of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, P.R. ChinaLiang‐Sheng LiaoInstitute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Suzhou, Jiangsu 215123, ChinaYang YangDepartment of Materials Science and Engineering, University of California, Los Angeles, California 90095, United States

2019en

ABI

Аннотация

All-inorganic-based perovskites achieved by replacing the organic component with cesium (Cs) have drawn more attention because of their intrinsic inorganic stability. However, the cell efficiency in all-inorganic perovskite solar cells is still far below that in organic–inorganic hybrid perovskite-based devices. Here, we develop a new strategy to mediate the CsPbI2Br crystallization by directly doping copper(II) bromide (CuBr2) into a perovskite precursor. The incorporation of CuBr2 played a role in retarding the crystallization dynamics process of CsPbI2Br film, resulting in a high-quality all-inorganic perovskite film with enlarged grain size, improved carrier mobilities, and reduced trap states. The fabricated perovskite solar cells delivered a champion power conversion efficiency of 16.15%, which is the highest efficiency in CsPbI2Br based all-inorganic perovskite solar cells and largely higher than 13.24% for pristine CsPbI2Br based device. The developed doping method paves a new route to fabricate high-performance all-inorganic perovskite solar cells.

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Идентификаторы

DOI: 10.1021/acs.nanolett.9b01553

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar