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Optical and structural properties of copper doped CdS thin films prepared by pulsed laser deposition

Mahdavi, S. M ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: Sharif University of Technology , 2008
  3. Abstract:
  4. This paper presents the study of the structural and optical properties of copper doped cadmium sulfide thin films prepared by pulsed Nd:YAG laser. The copper concentration in the targets was varied from 0.05% to 5% in weight and they were heated at a temperature of 500°C in air for one hour. It was observed that annealing un-doped and doped thin films at temperatures above 160°C leads to an abrupt increase in the optical transmission, changing from dark brownish to transparent yellowish. For annealed samples at 300°C, increasing Cu concentration from 0.0% to 2%, leads to an increase in the optical transmission up to 80%, at a wavelength of about 700 nm. XRD patterns showed the hexagonal phase of cadmium sulfide and a number of CdO peaks relating to the partial oxidation of cadmium. The XPS spectra of the annealed samples indicate an accumulation of Cu at the surface. Therefore, Cu impurity can enhance CdS oxidation and the size of the crystallites. The highest value of the photo-current for the samples is related to the lowest Cu concentration, i.e: 0.05%. © Sharif University of Technology, June 2008
  5. Keywords:
  6. Annealing ; Cadmium sulfide ; Copper compounds ; Film preparation ; II-VI semiconductors ; Light transmission ; Neodymium lasers ; Optical properties ; Pulsed laser deposition ; Pulsed lasers ; Sulfur compounds ; Yttrium aluminum garnet ; Annealed samples ; Copper concentration ; Cu concentrations ; Hexagonal phase ; Partial oxidations ; Pulsed Nd:YAG laser ; Structural and optical properties ; Sulfide thin films ; Thin films ; Cadmium ; Concentration (composition) ; Copper ; Film ; Optical property ; Oxidation ; Sulfide ; Temperature effect ; X-ray diffraction
  7. Source: Scientia Iranica ; Volume 15, Issue 3 , 2008 , Pages 360-365 ; 10263098 (ISSN)
  8. URL: https://www.sid.ir/en/journal/ViewPaper.aspx?id=118929