Paper Based ZnO Thin Film UV Light Detector Using Graphite Pencil Based Electrodes
Mohd A. Ansari, Daipayan Dasgupta, K. Sreenivas
Volume 2, Issue 7, Page 428-432, Year 2017 | DOI: 10.5185/amp.2017/705
Keywords: ZnO, thin films, UV light, graphite, papers, detector
Abstract: Ultraviolet (UV) light detection characteristics with sputtered ZnO films deposited on paper with graphite pencil drawn conducting inter-digital electrodes on normal paper have been investigated. Structural, electrical and microstructural properties of ZnO films grown by magnetron sputtering technique at under different sputtering pressures have been evaluated for ultraviolet (UV) light detection. Different types of paper used as substrate material, and the influence of their surface microstructure on the growth of ZnO film quality is examined. Films deposited on the fibrous paper are found to be polycrystalline, whereas the same films on dense glass substrates promote a c-axis oriented growth. The nucleation of sputtered ZnO films on paper is found to occur along the fine fibers of the paper and vary with sputtering pressure. Films grown at higher sputtering pressures (30 to 40 mTorr) in Ar/O2 =50:50 are found to yield dense deposits. Pencil drawn inter-digital electrode structures on paper overlaid with 0.25 µm thick ZnO films exhibit reproducible photo response to ultraviolet (UV) light (l = 365 nm), with low dark current. It’s important for low prize and easy fabrication of optoelectronic foldable devices. Copyright © 2017 VBRI Press.