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Lattice reconstruction of La-incorporated CsPbI2Br with suppressed phase transition for air-processed all-inorganic perovskite solar cells

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Abstract

Inorganic CsPbI2Br halide perovskite has received extensive attention due to its excellent thermal stability and suitable bandgap for high-performance solar cells. However, CsPbI2Br can easily transform from the perovskite phase to the non-perovskite phase due to a water vapour-induced phase transition under ambient conditions, leading to a rapid degradation of device performance. Herein, we introduced lanthanum (La3+) ions into the lattice to stabilize the perovskite phase in CsPbI2Br-based all-inorganic solar cells. A power conversion efficiency of 8.03% was obtained at an optimized La3+-doping level of 2%, leading to a 27% efficiency improvement. Moreover, the La3+-doped solar cell retained 90% of its efficiency in ambient air for 400 h, showing a significantly enhanced moisture stability compared to that of the pristine (undoped) device. Detailed analysis indicates that La3+-ions can induce lattice shrinking and thus inhibit the formation of a non-perovskite phase, and enhance the charge carrier lifetime, which contribute to the improved moisture stability and efficiency. Our results indicate that highly stable all-inorganic solar cells can be produced in an air atmosphere, showing great potential for future commercialization.

Graphical abstract: Lattice reconstruction of La-incorporated CsPbI2Br with suppressed phase transition for air-processed all-inorganic perovskite solar cells

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Article information


Submitted
19 Oct 2019
Accepted
11 Jan 2020
First published
13 Jan 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Lattice reconstruction of La-incorporated CsPbI2Br with suppressed phase transition for air-processed all-inorganic perovskite solar cells

S. Chen, T. Zhang, X. Liu, J. Qiao, L. Peng, J. Wang, Y. Liu, T. Yang and J. Lin, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05736F

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