Abstract
Zinc-doped In2S3 thin films have been deposited by spray pyrolysis method at 350 °C on glass substrates with ITO contacts. The samples were sealed under vacuum (10−3 Torr) into a Pyrex tube and then annealed for 2 h at temperatures ranging from 300 to 450 °C with a step of 50 °C. The effect of the annealing temperature (Ta) on structural, morphological and optical properties of the In2S3 films was studied. The films, annealed at Ta ≤ 300 °C, result in films that consist of tetragonal β-In2S3 phase with (220) preferential orientation, while for films annealed at Ta > 300 °C, a structural transition from tetragonal to cubic β-In2S3 occurs with (400) preferential orientation. The film grain size decreases from 42 to 33 nm. The surface morphology analysis reveals that the films annealed at 300 °C present an average roughness of 40 nm. The optical band gap is found to be direct and it decreases with the increase of annealing temperature. A higher optical transmittance of 80 % is obtained at Ta = 350 °C.
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Acknowledgments
The authors would like to thank the research and technology center of energy (Tunis, Tunisia) for AFM characterization and USCR-X-Ray Diffraction (Faculté des Sciences de Tunis, Tunisia) for XRD measurements. We gratefully acknowledge Abdessalem Kouki (Faculté des Sciences de Bizerte, Tunisia) for TEM measurements.
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Koaib, J., Bouguila, N., Kraini, M. et al. Effect of vacuum annealing temperature on structural, morphological and optical properties of In2S3:Zn films deposited by spray pyrolysis. J Mater Sci: Mater Electron 27, 9216–9225 (2016). https://doi.org/10.1007/s10854-016-4959-6
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DOI: https://doi.org/10.1007/s10854-016-4959-6