Effect of Annealing Temperature on the Optical Parameters of CdS Thin Films Prepared by Thermal Evaporation Method

Thitinai Gaewdang; Ngamnit Wongcharoen; Tiparatana Wongcharoen

doi:10.4028/www.scientific.net/AMR.747.329

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 747Effect of Annealing Temperature on the Optical...

Effect of Annealing Temperature on the Optical Parameters of CdS Thin Films Prepared by Thermal Evaporation Method

Abstract:

CdS thin films were prepared by thermal evaporation onto glass substrate in vacuum better than 5.5x10^-5 mbar. The obtained films were subsequently annealed in a pure nitrogen atmosphere at temperature between 100 to 500°C for 30 min. The crystal structure and surface morphology of the as-deposited and annealed films were investigated by XRD and SEM, respectively. Optical band gap and Urbach tail values of the films, determined from spectral transmission data, were found to be slightly varied in the range 2.36-2.40 eV and 110-160 meV, respectively, due to annealing temperature. The refractive index of the films was also evaluated from the spectral transmission data. The dependence of the refractive index on the wavelength obeys the single oscillator model, from which the important parameters such as refractive index, extinction coefficient, oscillator energy (E₀) and dispersion energy (E_d) of the films with different annealing temperatures were determined. From the experimental results, the optical parameters of the films are obviously influenced by annealing temperature.

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Periodical:

Advanced Materials Research (Volume 747)

Pages:

329-332

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.747.329

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Online since:

August 2013

Authors:

Thitinai Gaewdang, Ngamnit Wongcharoen, Tiparatana Wongcharoen

Keywords:

CdS Thin Films, Optical Parameters, Thermal Evaporation, Transmission Spectra

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