Structural, Optical, and Electrical Properties of CdTe Thin Films Deposited by Glancing Angle Deposition
A. A. El-Amin,
In this paper, glancing angle deposition technique (GLAD) has been used to grow cadmium telluride (CdTe) thin film by vacuum
thermal method on glass substrates. During deposition, the substrate temperature was maintained at 20°C. Due to shadowing effect,
the oblique angle deposition technique can produce nanorods tilted toward the incident deposition flux. The evaporated atoms arrive at
the growing interface at a fixed angle θ, measured from the normal to the substrate surface. An XRD picture, for nonfixed substrate an
amorphous film has been seen at small angles (0º, 15º, 30º, 40º) has been obtained. Films deposited at large angles (50º, 60º, 65º, 70º,
80º, 85º) was found to be poly-crystalline in nature along the peak intensity direction. The surface morphology has shown an improvement
without the presence of secondary phases for higher incident angles (θ>60°). It has been observed that the use of this growth technique
leads to an improvement in the optical properties of the films. The transmittance T and reflectance R spectra of CdTe films, deposited
at different incident angles without substrate rotation have been obtained. High absorption coefficients (2x104– 8x104 cm-1) in the
visible range and near-IR spectral range have been observed. Cell efficiency of 7.04 %, and fill factor of 70.6% have been obtained for
CdTe thin films of thickness 450 μm by GLAD technique, deposited at fixed substrate and incident angle 65°.
Keywords: CdTe, thin films, GLAD technique, structural properties, morphological properties, electrical characteristics.
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