Optical and dielectric properties of junctionlike CdS nanocomposites embedded in polymer matrix

被引：0
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作者：
Mondal, S.P. [1 ]
Mullick, H. [1 ]
Lavanya, T. [1 ]
Dhar, A. [1 ]
Ray, S.K. [1 ]
Lahiri, S.K. [2 ]
机构：
[1] Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721 302, India
[2] SRIC, Indian Institute of Technology, Kharagpur 721 302, India
来源：
Journal of Applied Physics | 2007年 / 102卷 / 06期
关键词：
CdS nanocomposites have been grown in a polymer (polyvinyl alcohol) matrix using a simple chemical bath deposition process. Transmission electron micrographs of nanocomposites grown at different solution temperatures revealed the formation of isolated as well as junctionlike structures. X-ray and selected area electron diffraction patterns show that the nanocomposites are polycrystalline with cubic CdS phase. Optical band gaps of nanocomposite films are found to decrease (3.26-2.86 eV) with the increase in bath temperature from 70 to 90°C. Photoluminescence spectra show strong green emission attributed to the Cd2+ or Cd+ ion-related recombination via moderately deep trap states. The nanocomposites show an enormous enhancement of dielectric constant in polyvinyl alcohol matrix over a frequency range of 40 Hz-10 MHz. © 2007 American Institute of Physics;
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