Determination of Energy Band Gap and Absorption Coefficient of Thin Films of Zinc Sulphide, Copper Phthalocyanin and Multilayer Zns-Cupc from its Optical Studies

Shaji Varghesea¹, Mercy Iypeb¹*, E. J. Mathewc² and C. S. Menona³

¹School of Pure and Applied Physics, M.G. University, Kottayam- 686 560 (India)

²Department of Chemistry, Marthoma College, Tiruvalla-689 103 (India)

³Department of Chemistry, S.B. College, Changanacherry- 689 103 (India)

ABSTRACT:

Zine Sulphide thin films are deposited onto glass substrates by chemical bath deposition technique (CBD). Thin films of Copper Phthalocyanine (CuPc) are sublimed onto glass substrates in high vacuum at room temperature by thermal evaporation technique. Multi layer ZnS-CuPc thin films are obtained from ZnS films grown on glass substrates by CBD technique and subsequently vacuum subliming CuPc onto ZnS films. These films are annealed at different temperatures. Optical properties of ZnS, CuPc and multi layer ZnS-CuPc thin films are studied in a UV-VIS- Spectro photometer and the absorbance recorded as a function of photon energy. The optical energy band gap and maximum absorption coefficient of the as deposited and annealed sampled samples are determined.

KEYWORDS:

Thin films; Energy band gap; Absorption coefficient

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Copy the following to cite this article: Varghesea S, Iypeb M, Mathewc E. J, Menona C. S. Determination of Energy Band Gap and Absorption Coefficient of Thin Films of Zinc Sulphide, Copper Phthalocyanin and Multilayer Zns-Cupc from its Optical Studies. Orient J Chem 2002;18(2).

Copy the following to cite this URL: Varghesea S, Iypeb M, Mathewc E. J, Menona C. S. Determination of Energy Band Gap and Absorption Coefficient of Thin Films of Zinc Sulphide, Copper Phthalocyanin and Multilayer Zns-Cupc from its Optical Studies. Orient J Chem 2002;18(2). Available from: http://www.orientjchem.org/?p=17351