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
Sudha Kartha, C; Vijayakumar, K P; Meril, Mathew; Angel, Susan Cherian(Elsevier, September 20, 2009)
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Abstract:
Effect of chlorine doping on the opto-electronic properties of β-In2S3 thin film, deposited by spray pyrolysis
technique is studied for the first time. Chlorine was incorporated in the spray solution, using HCl. Pristine
sample prepared using In(NO3)3 and thiourea as the precursors showed very low photosensitivity. But upon
adding optimum quantity of chlorine, the photosensitivity increased by 3 orders. X-ray analysis revealed that
crystallinity was also increasing up to this optimum level of Cl concentration. It was also observed that
samples with high photosensitivity were having higher band gap. The present study proved that doping with
chlorine was beneficial as this could result in forming crystalline and photosensitive films of indium sulfide.