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9 results on '"Choudhary, Nityanand"'

6. Application of SRCBD S: SnO2nanostructured thin films as room temperature gas and humidity sensors

Author

Anand, B. C., Shashidhar, R., and Choudhary, Nityanand

Abstract

The films were synthesized by the Substrate Rotation Chemical Bath Deposition method and have been characterized by various techniques. It is found that stoichiometry and band gap of SnO2and S: SnO2can be controlled moderately by air annealing as-deposited films and substrate temperature strongly affects the surface morphology. The comparative chemiresistive performance of films was studied for sensing applications of test gases and humidity. The sensitivity and relative sensor response of 5 ppm ethanol at room temperature were better than other test gases. The films annealed in air at 300, 400 and 450 °C for 1 h have excellent responses towards propanol, ethanol, and acetone, respectively. In general, the figure of merit of the synthesized gas sensor is found to vary from 2.8 to 24%, respectively. Annealed films at 350 °C for one hour have ultrahigh response towards humidity. Response-recovery time was found to vary as a function of annealing temperature due to the decrement in sensor impedance. Selectivity of the gas sensor for test gases was found to reach its maximum due to variation of SS+Snfrom 0.088 to 0.011. SRCBD has been reported to fabricate gas-humidity sensors economically with better steady and stable responses. The MOS sensor has shown ultrahigh humidity response and reasonable response at a low ppm of acetone gas at room temperature, which may be suitable as acetone breath analysis for seriously diabetic patients.

Published
2023
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8. Thickness dependent studies of hetero-junction solar cell synthesized on quartz substrate by spray pyrolysis technique.

Author

Shashidhar, R. and Choudhary, Nityanand

Subjects
SOLAR cells, PYROLYSIS, OPEN-circuit voltage, SEMICONDUCTOR films, ACTIVATION energy
Abstract

Variable thickness hetero-junction solar cells synthesized on quartz substrate by spray pyrolysis technique synthesized quartz based solar cells have been found to possess cell parameters such as open circuit voltage, saturation current density, fill factor and efficiency in the range of 191 - 449 mV, 2×10-9 - 0.11×10-6 A cm-2, 15 - 20% and 0.2×10-9 - 3.35×10-6 % at 206 mW/cm² (at air mass 5.6), respectively. Series and shunt resistance of the solar cells have been found to vary with the thickness of semiconductor films. Thick film solar cells are found to possess reasonably good cell parameters compared to thin film solar cells due to enhancement of charge concentration, mobility, grain size, variation of optical band gap, excesses atomic percentage of Ti, Cu, Te, Sn elements in TiO2, CuO, CdTe, SnS films and less structural defects, increment of activation energy as well as existence of mixed phase at the Schottky barrier. The optical response of hetero-junction solar cells is found to be thickness dependent. Good rectifying characteristic has been reported in the present work for both thick and thin hetero-junction solar cells. All the measurements have been performed in air without protection against oxygen gas or moisture, which shows the stability of spray pyrolyzed thin films. [ABSTRACT FROM AUTHOR]

Published
2020

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