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ARTICLE

Annealing effects on the structural and optical behavior of Cu₂Se_0.8Te_0.2 thin film

S. M. Hadi^*, I. H. Khudayer

Department of Physics, College of Education for Pure Science / Ibn Al-Haitham, University of Baghdad, Baghdad, Iraq

* Corresponding Author:

Chalcogenide Letters 2024, 21(11), 885-893. https://doi.org/10.15251/CL.2024.2111.885

Received 22 August 2024; Accepted 08 November 2024;

Abstract

Chalcogenide have attracted great interest over the last years due to their thermal, electrical and optical properties. Understanding the crystal structures of chalcogenide is crucial in the hunt for novel materials. In this study, we prepared Cu₂Se_0.8Te_0.2 thin film on a glass substrate using thermal evaporation method and then annealed at different temperatures (403, 453 &503) K to study the effect of annealing on the structure and optical properties of the film, we find that Cu₂Se_0.8Te_0.2 the composition is cubic structural and this is shown by X-ray analyses. And the optical properties improve with different annealing degrees, that is annealing reduces absorption while increasing transmittance, and so we find the optical energy gap increasing by increasing annealing where it is (1.1) eV at room temperature and it becomes (1.7) eV counting the temperature of 503 K. Thus, Cu₂Se_0.8Te_0.2 compound can be adopted as a thin film to further improve the solar cell's photoelectric performance.

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Keywords

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