Abstract
STUDY OF OPTICAL AND ELECTRICAL PROPERTIES OF SPRAY PYROLYTICALLY DEPOSITED CdZnSe2xTe2(1-x) THIN FILMS FOR X=0.75
S. A. Gaikwad*
ABSTRACT
Spray pyrolysis is a simple, inexpensive and economical method to produce a thin film on large substrate area. Thin films of CdZnSe2xTe2(1-x) for composition parameter ,x.=0.75 at a substrate temperature of 3000Care prepared by spray pyrolysis technique. From the optical transmission and reflection spectra, absorption coefficient (?) was calculated and was of the order of 104 cm-1..Band gap energy were determined from absorbance measurement in visible range as 2.47 eV using Tauc theory. It shows that the main transition at the fundamental absorption edge is a direct allowed transition. The refractive index(n) and extinction coefficient(k) both decreases as wavelength increases which shows that the optical constants are most suitable for many scientific studies and technological applications such as heat mirrors, transparent electrodes and solar cells. The activation energy increases at higher temperature may be due to attributed to the increase of band gap. Hence the grain size of the films increases. This effect reduces the grain boundry effect. The XRD pattern shows number of peaks indicating that the films are poly crystalline in nature. The analysis of spectrum indicated that the ternary films are having throughout cubic structure. The value of lattice parameter ? a? is 6.1451 A?.
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