Effect of Substrate Temperature on the Structural and Optical Properties of Nanocrystalline Cadmium Selenide Thin Films Prepared by Electron Beam Evaporation Technique

N.J. Suthan Kissingera, J. Suthagarb, B. Saravana Kumarc, T. Balasubramaniamd and K. Perumale aDepartment of Physics, Loyola Institute of Technology & Science, Tamilnadu, India bDepartment of Physics, Karunya University, Coimbatore - 641114, India cSchool of Advanced Materials Engineering,Chonbuk National University,South Korea dDepartment of Physics, Kongunadu College of Arts & Science, Coimbatore, India eDepartment of Physics, SRMV College of Arts & Science, Coimbatore - 641020, India

Received: March 22, 2010; in final form: July 9, 2010

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Cadmium selenide (CdSe) thin films on glass substrates were prepared by physical vapour deposition under vacuum using the electron beam evaporated technique for different substrate temperatures: room temperature, 100, 200, 300°C, respectively. X-ray diffraction analysis indicates that the films are polycrystalline, having hexagonal (wurtzite) structure irrespective of their substrate temperature. All the films show most preferred orientation along (0 0 2) plane parallel to the substrates. The microstructural parameters such as particle size, stress, strain and dislocation density were calculated. The grain size of deposited CdSe films is small and is within the range of 18 to 42 nm. The optical absorption spectra of electrom beam deposited CdSe films were studied in the wavelength region of 250-2500 nm. The energy gap (Eg) values (allowed direct transitions), calculated from the absorption spectra, ranged between 1.77 and 1.92 eV. The surface morphological quality of electron beam evaporated CdSe films were analyzed by scanning electron microscopy and atomic force microscopy.

DOI: 10.12693/APhysPolA.118.623 PACS numbers: 68.37.Hk, 81.05.Dz