Sudha Kartha, C; Vijayakumar, K P; Poornima, N; Vimalkumar, T V(Elsevier, March 27, 2010)
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Abstract:
Effect of varying spray rate on the structure and optoelectronic properties of spray pyrolysed ZnO film
is analysed. ZnO films were characterised using different techniques such as X-ray diffraction (XRD),
photoluminescence, electrical resistivity measurement, and optical absorption. The XRD analysis proved
that, with the increase in spray rate, orientation of the grains changed from (1 0 1) plane to (0 0 2) plane.
The films exhibited luminescence in two regions—one was the ‘near band-edge’ (NBE) (∼380 nm) emission
and the other one was the ‘blue-green emission’ (∼503 nm). Intensity of the blue-green emission
decreased after orientation of grains shifted to (0 0 2) plane. Scanning electron microscope (SEM) analysis
of the films asserts that spray rate has major role in improving the crystallographic properties of
the films. Moreover resistivity of the films could be lowered to 2.4×10−2 cm without any doping or
post-deposition annealing