An influence of deposition temperature on structural,optical and electrical properties of sprayed ZnO thin films of identical thickness |
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Authors: | C.M. Mahajan M.G. Takwale |
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Affiliation: | 1. Department of Engineering Sciences and Humanities, Vishwakarma Institute of Technology, Pune 411 037, Maharashtra, India;2. School of Energy Studies, University of Pune, Pune 411 007, Maharashtra, India |
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Abstract: | Nanocrystalline ZnO thin films were deposited at different temperatures (Ts = 325 °C–500 °C) by intermittent spray pyrolysis technique. The thickness (300 ± 10 nm) independent effect of Ts on physical properties was explored. X-Ray diffraction analysis revealed the growth of wurtzite type polycrystalline ZnO films with dominant c-axis orientation along [002] direction. The crystallite size increased (31 nm–60 nm) and optical band-gap energy decreased (3.272 eV–3.242 eV) due to rise in Ts. Scanning electron microscopic analysis of films deposited at 450 °C confirmed uniform growth of vertically aligned ZnO nanorods. The films deposited at higher Ts demonstrated increased hydrophobic behavior. These films exhibited high transmittance (>91%), low dark resistivity (~10?2 Ω-cm), superior figure of merit (~10?3 Ω?1) and low sheet resistance (~102 Ω/□). The charge carrier concentration (η -/cm3) and mobility (μ – cm2V?1s?1) are primarily governed by crystallinity, grain boundary passivation and oxygen desorption effects. |
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Keywords: | ZnO thin films Wettability Desorption Structural Electrical Optical properties |
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