Issue 39, 2019

In situ formation of a 2D/3D heterostructure for efficient and stable CsPbI2Br solar cells

Abstract

Forming a 2D capping layer has been recognized as an effective strategy to improve both efficiency and stability of organic–inorganic perovskite solar cells. However, constructing a 2D/3D heterostructure is difficult for inorganic perovskites due to their resistance to cation exchange reaction. Here, we report an effective in situ growth method to form a 2D/3D heterostructure for inorganic CsPbI2Br perovskite. The 2D capping layer was found to form a type-II heterojunction with 3D perovskites, facilitating hole extraction at the perovskite/hole transport layer interface. When exposed to a humid environment, the 2D/3D perovskite films showed greatly enhanced phase stability as compared to the pristine 3D perovskite films. As a result, the optimized 2D/3D CsPbI2Br device reached a power conversion efficiency of 14.5% with improved short-circuit current and significantly enhanced device moisture stability.

Graphical abstract: In situ formation of a 2D/3D heterostructure for efficient and stable CsPbI2Br solar cells

Supplementary files

Article information

Article type
Paper
Submitted
06 Aug 2019
Accepted
22 Sep 2019
First published
27 Sep 2019

J. Mater. Chem. A, 2019,7, 22675-22682

In situ formation of a 2D/3D heterostructure for efficient and stable CsPbI2Br solar cells

M. Tai, Y. Zhou, X. Yin, J. Han, Q. Zhang, Y. Zhou and H. Lin, J. Mater. Chem. A, 2019, 7, 22675 DOI: 10.1039/C9TA08564E

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