An Investigation on CdSeTe/CdTe Stacks Deposited by Evaporation: Impact of Halide Treatment Depending on the Applied Surface

• Published in: Physica status solidi. A, Applications and materials science Applications and materials science, 2024-01, Vol.221 (2), p.n/a
• Main Authors: Çiriş, Ali, Atasoy, Yavuz, Tomakin, Murat, Bacaksız, Emin
• Format: Article
• Language: English
• Subjects: Alloying; Cadmium chloride; CdCl2 halide treatments; CdSeTe/CdTe; Crystallization; Evaporation; Interlayers; Optical properties; Phase distribution; Photoluminescence; Photovoltaic cells; Solar cells; Solid phases; Stacks; vacuum evaporation
• ISSN: 1862-6300; 1862-6319
• DOI: 10.1002/pssa.202300512

Among the methods applied to modify the characteristics of CdSeTe/CdTe stacks, one of the most well‐known and widely used procedures is the CdCl2 halide treatment. In this connection, the influence of CdCl2 on microstructural properties, phase distribution, and optical properties of CdSeTe/CdTe stack depending on location of the employed surface is investigated. In CdSeTe/CdTe stacks deposited by evaporation in vacuum, CdCl2 halide treatment is applied to the interface of CdSeTe and CdTe, the upper surface of CdTe, and both surface regions of the stack. CdCl2 treatment applied depending on the region has a definite effect on the phase structure, interlayer CdSexTe1−x alloying rate, and crystallization quality of the stack structure. Regardless of the applied region, all CdCl2‐treated stacks exhibit a granular and compact surface morphology. On the other hand, CdCl2 treated only on single surface results in a shift of the absorption edge to the shorter wavelength, but rather to the long spectral region for both surfaces. The photoluminescence spectra reveal the presence of band emissions of the CdTe layer and CdSeTe alloys. Overall, the findings of the study indicate that only the upper‐surface application of CdCl2 has more promising features for potential solar cell applications. Herein, CdSeTe/CdTe stacks are deposited by evaporation in vacuum and CdCl2 is applied by wet processing. The results of the analyzes show a clear effect of CdCl2 halide treatment on the alloying, crystallization, surface morphology, and optical properties of the stacks, depending on the applied region.