Effects of Mixed Halide Ions Incorporation on CH3NH3Pb(I,Br)3-x(SCN)x Perovskite Films via Solution Deposition Route

Vorrada Loryuenyong; Peeranut Kulchartchai; Phatsawat Audomcharoensak; Penpaka Jeyakom; Achanai Buasri

doi:10.4028/www.scientific.net/KEM.821.395

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 821Effects of Mixed Halide Ions Incorporation on...

Effects of Mixed Halide Ions Incorporation on CH₃NH₃Pb(I,Br)_3-x(SCN)_x Perovskite Films via Solution Deposition Route

Abstract:

Nowadays, a novel solar cell based on an organolead halide perovskite structure, CH₃NH₃PbX₃ (X is a halogen), has been gained a great attraction due to its promising photovoltaic performance. However, their humidity limitation is a serious drawback, which limits practical application of perovskite-based solar cells. In this study, we investigated the improvement of humidity stability and the influence of halide radicals (I^- and Br^-) on optical and physical properties of thiocyanic-modified CH₃NH₃PbX₃ or CH₃NH₃PbX_3-x(SCN)_x films, prepared by two-step deposition method. The mixtures of CH₃NH₃I and CH₃NH₃Br solution with different molar ratios were prepared to control the I^-:Br^- ratios in perovskite films. The characterization of perovskite films was tested by XRD, UV-Vis spectrophotometer, UV-Vis DRS spectroscopy, FE-SEM, and moisture stability testing under constant relative humidity. The results showed that different molar ratios of I^- and Br^- could strongly affect the properties of perovskite films. The larger amount of Br^- promoted the complete reaction of perovskite, larger energy band gap, and higher moisture stability. However, the prepared films were likely to exhibit phase separation due to the formation of iodide-rich and bromide-rich domains.

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Periodical:

Key Engineering Materials (Volume 821)

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395-400

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.821.395

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September 2019

Authors:

Vorrada Loryuenyong*, Peeranut Kulchartchai, Phatsawat Audomcharoensak, Penpaka Jeyakom, Achanai Buasri

Keywords:

Halides, Humidity, Organolead Halide Perovskite, Perovskite Solar Cells, Thiocyanate

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