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Ultraviolet photodetectors based on ZnO sheets: The effect of sheet size on photoresponse properties

Ghasempour Ardakani, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apsusc.2012.02.024
  3. Abstract:
  4. In this work, ultraviolet photodetectors based on electrodeposited ZnO sheet thin films were fabricated on a glass substrate. Before electrodeposition, a thin buffer layer of ZnO was deposited on the glass by pulsed laser deposition method. This layer not only acted as a nucleation site for ZnO sheet growth, but also made it possible to use cheap glass substrate instead of conventional fluorine-doped tin oxide (FTO) substrate. Our results showed that photoresponse properties of the photodetectors strongly depend on the sheet sizes. The smaller sheets exhibited enhanced photosensitivity, shortened fall times and decreased gain compared to larger ones. We showed that photodetectors based on ZnO sheets have a faster response than ones based on polycrystalline films. It was also shown that even less response time could be obtained by using comb-like electrodes instead of two-electrode
  5. Keywords:
  6. Electrodeposition ; Response time ; ZnO sheets ; Comb-like ; Fluorine doped tin oxide ; Glass substrates ; Nucleation sites ; Photoresponses ; Polycrystalline film ; Sheet size ; Ultra-violet photodetectors ; UV photodetector ; ZnO ; Electrodeposition ; Nanocomposites ; Photodetectors ; Pulsed laser deposition ; Response time (computer systems) ; Substrates ; Tin ; Tin oxides ; Zinc oxide
  7. Source: Applied Surface Science ; Volume 258, Issue 14 , 2012 , Pages 5405-5411 ; 01694332 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0169433212002462