Nanostructured CdTe films by Glancing Angle Deposition
(Room Room 104-A)
29 Apr 19
3:00 PM
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3:20 PM
Tracks:
Coatings for Energy Conversion and Related Processes
Glancing angle deposition (GLAD) is used to engineer different microstructures in thin films, resulting in wide variation in opto-electronic and micro-structural properties. GLAD RF-sputtered CdTe thin films prepared at various source flux angle relative to the substrate normal are deposited on soda-lime glass at room temperature. The dependence of crystallite orientation / size, morphology, and optical properties of CdTe films on source flux angle before and after CdCl2 treatment are identified using scanning electron microscopy (SEM), x-ray diffraction (XRD), and spectroscopic ellipsometry (SE). From cross-sectional micrographs, columnar structure from GLAD and its variance with processing conditions observed. XRD shows cubic crystal structure for films deposited at lower source flux angles while those at higher source flux angles show evidence of hexagonal crystal structure. The post-deposition CdCl2 treated samples show enhancement in grain size. The optical response in the form of complex dielectric function (ε = ε1 + i ε2) in UV-NIR range for both series of samples are obtained from SE.