The effect of target annealing temperature on optical and structural properties and composition of CdS thin films prepared by pulsed laser

We studied the effect of target annealing temperature on optical and structural properties and composition of CdS thin films prepared by pulsed Nd:YAG laser. Deposited samples from annealed targets at 300°C showed a mixed cubic and hexagonal structure, a band gap of about 2.56eV and Cd/S ratio equal...

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Bibliographic Details
Published in:Optical materials 2005-09, Vol.27 (10), p.1583-1586
Main Authors: Mahdavi, S.M., Iraji zad, A., Tilaki, R.M.
Format: Article
Language:English
Subjects:
Cadmium sulfide
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Laser deposition
Nd: YAG
Optical materials
Optics
Other nonlinear optical materials
photorefractive and semiconductor materials
Physics
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Summary:We studied the effect of target annealing temperature on optical and structural properties and composition of CdS thin films prepared by pulsed Nd:YAG laser. Deposited samples from annealed targets at 300°C showed a mixed cubic and hexagonal structure, a band gap of about 2.56eV and Cd/S ratio equal 1. This ratio increased to 2.40 and its band gap decreased to 2.46eV when the sample was annealed at 500°C for 1h in air. However, films prepared from annealed targets at 500°C became dark due to existence of polymorphous phase of CdO. Films changed to transparent yellow color with a hexagonal CdS structure and some peaks related to CdO after annealing above 250°C in air. Its band gap value increased from 2.36eV to 2.41eV after annealing at 250 and 500°C respectively.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2004.04.020