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Volume 11
Issue 9
10.3390/coatings11091064
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Article

The Effect of the Deposition Method on the Structural and Optical Properties of ZnS Thin Films

by
Iosif-Daniel Simandan
1,
Florinel Sava
1,
Angel-Theodor Buruiana
1,2,
Ion Burducea
3,
Nicu Becherescu
4,
Claudia Mihai
1,
Alin Velea
1,* and
Aurelian-Catalin Galca
1
1
National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
2
Faculty of Physics, University of Bucharest, Atomistilor 405, 077125 Magurele, Romania
3
Horia Hulubei National Institute of Physics & Nuclear Engineering, 077125 Magurele, Romania
4
Apel Laser Ltd., Vanatorilor 25, 077135 Mogosoaia, Romania
*
Author to whom correspondence should be addressed.
Academic Editor: Aomar Hadjadj
Coatings 2021, 11(9), 1064; https://doi.org/10.3390/coatings11091064
Received: 4 August 2021 / Revised: 31 August 2021 / Accepted: 1 September 2021 / Published: 3 September 2021
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Abstract

ZnS is a wide band gap material which was proposed as a possible candidate to replace CdS as a buffer layer in solar cells. However, the structural and optical properties are influenced by the deposition method. ZnS thin films were prepared using magnetron sputtering (MS), pulsed laser deposition (PLD), and a combined deposition technique that uses the same bulk target for sputtering and PLD at the same time, named MSPLD. The compositional, structural, and optical properties of the as-deposited and annealed films were inferred from Rutherford backscattering spectrometry, X-ray diffraction, X-ray reflectometry, Raman spectroscopy, and spectroscopic ellipsometry. PLD leads to the best stoichiometric transfer from target to substrate, MS makes fully amorphous films, whereas MSPLD facilitates obtaining the densest films. The study reveals that the band gap is only slightly influenced by the deposition method, or by annealing, which is encouraging for photovoltaic applications. However, sulphur vacancies contribute to lowering the bandgap and therefore should be controlled. Moreover, the results add valuable information towards the understanding of ZnS polymorphism. The combined MSPLD method offers several advantages such as an increased deposition rate and the possibility to tune the optical properties of the obtained thin films. View Full-Text
Keywords: ZnS; polymorphism; structure; pulsed laser deposition; magnetron sputtering ZnS; polymorphism; structure; pulsed laser deposition; magnetron sputtering
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MDPI and ACS Style

Simandan, I.-D.; Sava, F.; Buruiana, A.-T.; Burducea, I.; Becherescu, N.; Mihai, C.; Velea, A.; Galca, A.-C. The Effect of the Deposition Method on the Structural and Optical Properties of ZnS Thin Films. Coatings 2021, 11, 1064. https://doi.org/10.3390/coatings11091064

AMA Style

Simandan I-D, Sava F, Buruiana A-T, Burducea I, Becherescu N, Mihai C, Velea A, Galca A-C. The Effect of the Deposition Method on the Structural and Optical Properties of ZnS Thin Films. Coatings. 2021; 11(9):1064. https://doi.org/10.3390/coatings11091064

Chicago/Turabian Style

Simandan, Iosif-Daniel, Florinel Sava, Angel-Theodor Buruiana, Ion Burducea, Nicu Becherescu, Claudia Mihai, Alin Velea, and Aurelian-Catalin Galca. 2021. "The Effect of the Deposition Method on the Structural and Optical Properties of ZnS Thin Films" Coatings 11, no. 9: 1064. https://doi.org/10.3390/coatings11091064

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