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• W4308306426 endingPage "113204" @default.
• W4308306426 startingPage "113204" @default.
• W4308306426 abstract "Cuprous(Ⅰ) iodide (CuI) is widely used as a conducting material in various optoelectronic devices. However, defect properties and instabilities lead to changes in the semiconductor properties of CuI, which seriously affects the stability of related optoelectronic devices. Therefore, in this paper, the decomposition and defect state properties of CuI films are investigated in depth. CuI was prepared by a simple iodination method and belongs to the zinc blende type structure, preferentially crystallizing along the (111) direction. Microscopic tests reveal that grains in CuI film are tightly bonded without obvious cracks or holes, and the grain size reaches 1.231 μm. In the subsequent spectral analysis, multiple emission peaks (free exciton and defect emission peak) were obtained by Gaussian fitting. The two major point defects (Cu vacancy (VCu) and I vacancy (VI)) in CuI were analyzed theoretically, and the calculated defect energy levels matched the energies of the emission peaks. The results of Gaussian waveform fitting and density functional calculations indicate the presence of VCu defects and VI defects in CuI. Significant variations in emission and electrical properties were observed in successive tests, indicating the relatively poor long-term stability of the CuI samples. The changes in the emission characteristics are mainly manifested by the weakening of the 416 nm emission and the enhancement of the 720 nm emission, while the changes in the electrical characteristics are mainly manifested by the increasing resistance. The above changes are attributed to the concentration of defect states, mainly due to the increase of VI defects and the decrease of VCu defects, hence the severe iodine decomposition occurs in the CuI samples. To inhibit the decomposition, three schemes (multiple iodination, multilayer iodination, and encapsulation) were proposed, and relevant experiments were conducted." @default.
• W4308306426 created "2022-11-10" @default.
• W4308306426 creator A5009511139 @default.
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• W4308306426 date "2022-12-01" @default.
• W4308306426 modified "2023-10-14" @default.
• W4308306426 title "Study on the decomposition of CuI films due to defect state instability" @default.
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• W4308306426 doi "https://doi.org/10.1016/j.optmat.2022.113204" @default.
• W4308306426 hasPublicationYear "2022" @default.
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