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Title: Physical properties of electron beam evaporated CdTe and CdTe:Cu thin films

In this paper, we report on physical properties of pure and Cu doped cadmium telluride (CdTe) films deposited onto corning 7059 microscopic glass substrates by electron beam evaporation technique. X-ray diffraction study showed that all the deposited films belong to amorphous nature. The average transmittance of the films is varied between 77% and 90%. The optical energy band gap of pure CdTe film is 1.57 eV and it decreased to 1.47 eV upon 4 wt. % of Cu addition, which may be due to the extension of localized states in the band structure. The refractive index of the films was calculated using Swanepoel method. It was observed that the dispersion data obeyed the single oscillator of the Wemple-Didomenico model, from which the dispersion energy (E{sub d}) parameters, dielectric constants, plasma frequency, and oscillator energy (E{sub o}) of CdTe and CdTe:Cu films were calculated and discussed in detail with the light of possible mechanisms underlying the phenomena. The variation in intensity of photoluminescence band edge emission peak observed at 820 nm with Cu dopant is due to the change in surface state density. The observed trigonal lattice of Te peaks in the micro-Raman spectra confirms the p-type conductive nature of films, which was further corroborated bymore » the Hall effect measurement. The lowest resistivity of 6.61 × 10{sup 4} Ω cm was obtained for the CdTe:Cu (3 wt. %) film.« less
Authors:
 [1] ;  [2] ;  [3] ; ;  [4]
  1. Department of Physics, Alagappa University, Karaikudi 630004 (India)
  2. Directorate of Distance Education, Alagappa University, Karaikudi 630004 (India)
  3. Department of Physics, Alagappa Chettiar College of Engineering and Technology, Karaikudi 630004 (India)
  4. UGC-DAE Consortium for Scientific Research, Indore 452001 (India)
Publication Date:
OSTI Identifier:
22402711
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CADMIUM TELLURIDES; DENSITY; DISPERSIONS; DOPED MATERIALS; ELECTRON BEAMS; EVAPORATION; OSCILLATORS; PERMITTIVITY; PHOTOLUMINESCENCE; REFRACTIVE INDEX; THIN FILMS; TRIGONAL LATTICES; X-RAY DIFFRACTION