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Nat Commun. 2019 Feb 18;10(1):815. doi: 10.1038/s41467-019-08507-4.

Strain engineering in perovskite solar cells and its impacts on carrier dynamics.

Author information

1
Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, Advanced Materials Experimental Center, School of Materials Science & Engineering, Beijing Institute of Technology, 100081, Beijing, China.
2
State Key Laboratory of Superhard Materials, Key Laboratory of Automobile Materials of MOE, and School of Materials Science and Engineering, Jilin University, 130012, Changchun, China.
3
Department of Materials Science and Engineering, College of Engineering, Peking University, 100871, Beijing, China.
4
Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
5
Department of Materials Science and Engineering, College of Science, China University of Petroleum, 102249, Beijing, China.
6
Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, 100124, Beijing, China.
7
Guangdong Key Lab of Nano-Micro Material Research, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Xili University Town, 518055, Shenzhen, Guangdong, China.
8
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081, Beijing, China.
9
State Key Laboratory of Superhard Materials, Key Laboratory of Automobile Materials of MOE, and School of Materials Science and Engineering, Jilin University, 130012, Changchun, China. lijun_zhang@jlu.edu.cn.
10
Department of Materials Science and Engineering, College of Engineering, Peking University, 100871, Beijing, China. happy_zhou@pku.edu.cn.
11
Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, Advanced Materials Experimental Center, School of Materials Science & Engineering, Beijing Institute of Technology, 100081, Beijing, China. qic@bit.edu.cn.

Abstract

The mixed halide perovskites have emerged as outstanding light absorbers for efficient solar cells. Unfortunately, it reveals inhomogeneity in these polycrystalline films due to composition separation, which leads to local lattice mismatches and emergent residual strains consequently. Thus far, the understanding of these residual strains and their effects on photovoltaic device performance is absent. Herein we study the evolution of residual strain over the films by depth-dependent grazing incident X-ray diffraction measurements. We identify the gradient distribution of in-plane strain component perpendicular to the substrate. Moreover, we reveal its impacts on the carrier dynamics over corresponding solar cells, which is stemmed from the strain induced energy bands bending of the perovskite absorber as indicated by first-principles calculations. Eventually, we modulate the status of residual strains in a controllable manner, which leads to enhanced PCEs up to 20.7% (certified) in devices via rational strain engineering.

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