Effects of Boron Doping on Structural, Optical and Electrical Properties of Cadmium Oxide Thin Films Prepared by Sol-Gel Spin Coating Method
Journal: International Journal of Advanced Scientific Research & Development (IJASRD) (Vol.02, No. 03)Publication Date: 2015-09-30
Authors : M. Thirumoorthi; J. Thomas Joseph Prakash;
Page : 98-106
Keywords : CdO:B Thin Films; Sol-Gel Spin Coating; Crystal Structure; Optical Properties.;
Abstract
Undoped and boron (B) doped cadmium oxide (CdO) thin films were obtained using cadmium acetate dehydrate and boric acid as precursor solutions by sol-gel spin coating method. The films were annealed at 500 oC and structural, electrical, optical and surface properties have been investigated. The recorded X- ray diffraction patterns indicated that all the films had preferential orientation along (111) plane and fit well with the cubic crystal structure. The minimum resistivity of 1.71×10-3 Ω cm was obtained for the film doped with 2.5 wt% boron. Scanning electron microscopy (SEM) images indicates that the boron doping was strongly influenced on surface morphology. An EDX spectrum shows that Cd and O elements are present in the solid films. Optical spectra showed that the average transmittance of doped films over 80 % in the visible region and the obtained optical band gap is higher (2.56 – 2.59eV) than the undoped (2.23eV) cadmium oxide thin films.
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