Jump to main content
Jump to site search


Lattice Reconstruction of La Incorporated CsPbI2Br with Suppressed Phase Transition for Air-Processed All-Inorganic Perovskite Solar Cells

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 in ambient conditions, leading to a rapid degradation of device performance. Herein, we introduced lanthanum ions (La3+) into the lattice to stabilize the perovskite phase in CsPbI2Br-based all-inorganic solar cells. A power conversion efficiency of 7.72% was obtained at an optimized La3+ doping level of 2%, leading to a 22% 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 the pristine (undoped) device. Detailed analysis indicates that La3+ ions can induce the lattice shrinking and thus inhibit the formation of 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 air atmosphere, showing great potential for future commercialization.

Back to tab navigation

Supplementary files

Article information


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

J. Mater. Chem. C, 2020, Accepted Manuscript
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, Accepted Manuscript , DOI: 10.1039/C9TC05736F

Social activity

Search articles by author

Spotlight

Advertisements