Journal
APPLIED PHYSICS LETTERS
Volume 121, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0097939
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Funding
- National Key Research and Development Program of China [2017YFA0206600]
- National Natural Science Foundation of China [52173192]
- Science and Technology Innovation Program of Hunan Province [2020RC4004]
- Special Funding for the Construction of Innovative Provinces in Hunan Province [2020GK2024]
- Free Exploration and Innovation Project of Central South University [2021zzts0507]
- High Performance Computing Center of Central South University
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This study develops a method of using cesium fluoride to improve the surface of perovskite films, reducing their defect density and enhancing the built-in potential of PSCs. Experimental results show that this method significantly increases the open-circuit voltage of PSCs and improves their stability.
Interfacial defects greatly influence the performance of perovskite solar cells (PSCs), and interface engineering is a powerful technique to promote the power conversion efficiency (PCE) of PSCs. Herein, an interfacial passivation strategy is developed employing cesium fluoride (CsF) to modify the surface of a perovskite film. Theoretical calculations suggest that the Cs+ and F- ions have a targeted passivation effect to decrease the defect density of the perovskite. Meanwhile, Cs+-formamidine(+) (FA(+)) and F--I- ion exchange can occur on the perovskite surface, which leads to the decline of the Fermi level of perovskite and reinforces the built-in potential of PSCs. Additionally, experiment results also confirm the reduction in the interfacial defects and the enhancement of the built-in potential. Consequently, the open-circuit voltage (V-oc) of PSCs is increased from 1.07 to 1.12 V, contributing to the promotion of the PCE. Furthermore, the stability of PSCs is obviously improved as well owing to the suppressed phase transition of alpha-phase perovskite. Our findings provide guidelines for surface modification of perovskite crystals to enhance the performance and stability of PSCs. Published under an exclusive license by AIP Publishing.
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