Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 522, Issue -, Pages 118-122Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.01.118
Keywords
Spray pyrolysis; Ultraviolet photodetector; N:ZnO; Alumina; ZnO buffer layer
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Funding
- Defense Research and Development Organization (DRDO), New Delhi [ERIP/ER/0503504/M/01/1007]
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We report study on the fabrication and characterization of an ultraviolet (UV) photodetectors based on N-doped ZnO films. The N-doped ZnO films with 10 at% N doping are spray deposited on to alumina substrates. The photoconductive UV detector based on N-doped ZnO thin films, having a metal-semiconductor-metal (MSM) configuration are fabricated using Al as a contact metal. The dependence of I-V characteristic under dark and illumination, spectral and transient photoresponse of the detector are investigated. The linear current-voltage (I-V) characteristics under forward bias exhibit ohmic metal-semiconductor contact. The UV photoconductive effect is observed showing fast response with switching on/off UV light illumination. The neutralization of photogenerated holes by negatively charged oxygen ion plays a key role in the photoconductive characteristics of N-doped ZnO polycrystalline films. (C) 2012 Elsevier B. V. All rights reserved.
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