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Title: Effect of substrate temperature on photoconductivity in CdS thin films
Authors: Singh, K Kunjabali
Kar, Manoranjan
Das, H L
Keywords: CdS thin films;Substrate temperature;Grain size;Photoconductivity;Activation energy
Issue Date: Feb-2010
Publisher: CSIR
Abstract: Photo-electronic properties of CdS thin films (0.25μm thick) grown by thermal evaporation (TE) method on cleaned glass substrates held at different substrate temperatures (Ts) in the range 300-473K have been studied under different intensities of white light, bias voltages and ambient temperatures. The grain sizes are found to increase with Ts which enhanced the photosensitivity of the films. The photosensitivity of the films has been found to increase with light intensity, Ts and bias voltage. The evaluation of dark and photo-activation energies and mobility activation energies show double photo-activation processes. The activation energies and the mobility activation energies are observed to be decreasing with increasing Ts and ambient temperature, and reveal the presence of various discrete trap distributions at different trap depths.
Page(s): 110-114
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.48(02) [February 2010]

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