Optical And Humidity Sensing Properties Of Pure Zno And Zno /Sno 2 Thin Films Deposited By Spray Paralysis Method
Journal Title: International Journal of Scientific Research and Management - Year 2015, Vol 3, Issue 7
Abstract
The present study , we have synthesized ZnO/SnO 2 thin films prepared by spray paralysis method and characterized by UV - visible transmission and photoluminescence (PL) spectroscopy and humidity sensing . In UV - visible spectroscopy thin film found to be transparent and its transmission is 20 % - 85 % . I n visible and infrared re gion with sharp cut off at 3 10 nm. In PL study shows UV emission which shift to lower wavelength as SnO 2 is introduced. The ratio of 1:5 in ZnO :SnO 2 , shows maximum PL intensity. The PL intensity is found to decrease wit h increase the ratio of SnO 2 in ZnO . The highest intensity peak centered at 3 75 to 4 1 5 nm which show the violet emission . T he presence of different broad peak shows the presence of defect states during synthesis and fabrication of the thin film s . T he humidity sensing of ZnO:SnO 2 thin films shows very low values of response and recovery time indicating potential candidature. Response and recovery t ime of samples is very low which shows suitability of prepared samples for humidity sensors
Authors and Affiliations
K. C. Dubey
Keywords
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