THE STABILITY STUDIES OF MIXED HALIDE PEROVSKITE CH3NH3PbBrXI3-X THIN FILMS IN AMBIENT WITH AIR HUMIDITY 70% USING UV-VIS SPECTROSCOPY AND X-RAY DIFFRACTION

Ayi Bahtiar; Khairul Habibie

doi:10.21009/SPEKTRA.052.03

Authors

Ayi Bahtiar
Khairul Habibie Department of Physics, Universitas Padjadjaran, Jl. Raya Bandung-Sumedang Km. 21 Jatinangor, Sumedang, Jawa Barat, 45363, Indonesia

DOI:

https://doi.org/10.21009/SPEKTRA.052.03

Keywords:

mixed halide perovskite, absorption spectra, crystal structure, humidity, stability

Abstract

Perovskite Solar Cells (PSC), with the efficiency of more than 22%, has shown promising prospects for the future of environmentally friendly technology. However, low stability on humidity is a major problem limiting the commercialization of PSC. The perovskite material commonly used as a perovskite solar-cell active material is methylammonium lead tri-iodide (CH₃NH₃PbI₃ or MAPbI₃) prepared with a mixture of methylammonium-iodide (MAI) and lead iodide (PbI₂). Perovskite material MAPbI₃ is hygroscopic and easily decomposed into its constituent material, thereby reducing the performance of the PSC. Meanwhile, perovskite methylammonium lead-bromide (MAPbBr₃) has higher moisture stability than MAPbI₃ because it has a cubic crystal structure that has high symmetry. However, the efficiency of solar cells using MAPbBr₃ as active material is lower than that of MAPbI₃, due to a higher bandgap (~2.2 eV) than that of MAPbI₃ (~1.5 eV). Therefore the wavelength range of sunlight absorbed by MAPbBr₃ is shorter. We have studied the effect of the ratio of Bromium ion (Br^-) insertion into MAPbI₃ perovskite, forming mixed perovskite halide MAPbBr_xI_3-x on the stability of thin perovskite films in ambient with air humidity 70%. The value of x is varied from x = 0, 0.25, 0.5, 0.75 and 3. We measured the evolution of UV-Vis spectra and XRD patterns of thin perovskite films. The MAPbBr₃ perovskite film is the most stable in high air relative humidity (> 70%). While mixed perovskite films with x = 0.5 are more stable as compared to the other x values based on absorption spectra. The XRD results showed that the stability of mixed halide perovskite is decreased with the increasing of x value.

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