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Microstructure, optical and photoluminescence properties of simple thermal evaporated CdS nanocrystalline films

D. SREEKANTHA REDDY1,* , B. KANG1, SEONG-CHO YU1, K. R. GUNASEKHAR2, K. NARASIMHA RAO2, A. DIVYA3, P. SREEDHARA REDDY3

Affiliation

  1. Department of Physics, Chungbuk National University, Cheongju 361-763, South Korea
  2. Department of Instrumentation, Indian Institute of Science, Bangalore-560012, India
  3. Department of Physics, Sri Venkateswara University, Tirupati-517502, India

Abstract

CdS nanocrystalline films were deposited on glass substrates by thermal evaporation at 300 K and 573K. All the films exhibited wurtzite structure with crystallite size varied from 10 - 20 nm. The sharp sudden fall of optical transmittance spectra shifted from 485 nm to 455 nm with increasing substrate temperature. The excitation wavelength of all films is about 500 nm and emission wavelengths 545 nm and 570 nm for all films. The possible optical and photoluminescence mechanisms are proposed in this paper. The photoluminescence of CdS nanocrystalline films enables them to have important applications in optoelectronic devices..

Keywords

CdS nanocrystalline films, Resistive thermal evaporation, Microstructure, Optical properties, Photoluminescence properties.

Submitted at: Oct. 28, 2007
Accepted at: Dec. 7, 2007

Citation

D. SREEKANTHA REDDY, B. KANG, SEONG-CHO YU, K. R. GUNASEKHAR, K. NARASIMHA RAO, A. DIVYA, P. SREEDHARA REDDY, Microstructure, optical and photoluminescence properties of simple thermal evaporated CdS nanocrystalline films, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 12, pp. 3747-3750 (2007)