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Published in: Journal of Electronic Materials 1/2023

19-10-2022 | Original Research Article

Influence of Post-Annealing on the Properties of Methylammonium Bismuth Iodide Perovskite Solar Cells Through the Hot Immersion Method

Authors: M. F. Achoi, S. Aiba, S. Kato, N. Kishi, T. Soga

Published in: Journal of Electronic Materials | Issue 1/2023

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Abstract

In this paper, the influence of post-annealing on the properties of methylammonium bismuth iodide (MBI) perovskite solar cells (PeSCs) fabricated through the hot immersion method (HIM) is reported. The post-annealing temperature varied between 100°C and 250°C. The XRD results showed that the crystallinity of the MBI film was improved, while the surface morphology showed that the flake-shaped structure was enhanced. On increasing the post-annealing temperature, an increase in the average grain size from 0.9 µm to 3 µm was observed. The increase in the grain size led to an enhancement of the optical properties with a narrower indirect bandgap at an extended absorption region towards a longer wavelength. Eventually, the performance of HIM-fabricated MBI PeSCs showed a twofold increase, i.e., from 0.14 V to 0.28 V, for open-circuit voltage, the short-circuit current density of the device increased by more than twofold, and power conversion efficiency increased up to 0.011% with a fivefold increase at 250°C. An improved morphology and enlarged grain size leads to a drastic increase in the efficiency of the devices. Our findings suggest that by using HIM, the performance of MBI solar cells can be improved by post-annealing, providing an alternative, simple method for the fabrication of Pb-free PeSCs in future work.

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Metadata
Title
Influence of Post-Annealing on the Properties of Methylammonium Bismuth Iodide Perovskite Solar Cells Through the Hot Immersion Method
Authors
M. F. Achoi
S. Aiba
S. Kato
N. Kishi
T. Soga
Publication date
19-10-2022
Publisher
Springer US
Published in
Journal of Electronic Materials / Issue 1/2023
Print ISSN: 0361-5235
Electronic ISSN: 1543-186X
DOI
https://doi.org/10.1007/s11664-022-09994-w

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