Dispersive optical constants and electrical properties of nanocrystalline CuInS2 thin films prepared by chemical spray pyrolysis
| Autor: | Albert Juma, Cosmas M. Muiva, Phindani Dube |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Potential well Materials science Borosilicate glass Annealing (metallurgy) Band gap Process Chemistry and Technology Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Nanocrystalline material Surfaces Coatings and Films Electronic Optical and Magnetic Materials 0103 physical sciences Materials Chemistry Ceramics and Composites Crystallite Thin film 0210 nano-technology Wurtzite crystal structure |
| Zdroj: | Ceramics International. 46:7396-7402 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2019.11.235 |
| Popis: | Nanocrystalline CuInS2 thin films were deposited on borosilicate glass substrates via chemical spray pyrolysis method. The structural, morphological, optical, and electrical properties were studied as a function of increasing annealing temperature from 250 to 350 C. XRD analysis showed mixed phases at lower temperatures with the preferred orientation shifting towards the (112) chalcopyrite CuInS2 plane at higher substrate temperature. The crystallite size increased slightly between 13 and 18 nm with increase in annealing temperature. The optical band gap was determined on basis of Tauc extrapolation method and the Wemple–Di-Domenico single oscillator model. Possible structural and quantum confinement effect may have resulted in relatively larger band gaps of 1.67–2.04 eV, relative to the bulk value of 1.5 eV. The presence of CuxS in the as-deposited and wurtzite peaks after annealing at 350 C play a role in influencing the optical and electrical properties of CuInS2 thin films. |
| Databáze: | OpenAIRE |
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