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Published November 15, 2018 | Version v1
Journal article Open

ENHANCEMENT IN UV SENSING PROPERTIES OF ZnO :Ag NANOSTRUCTURED FILMS BY SURFACE FUNCTIONALIZATION WITH NOBLE METALIC AND BIMETALLIC NANOPARTICLES

  • 1. Department of Microelectronics and Biomedical Engineering, Center Nanotechnology and Nanosensors, Technical University of Moldova, Chisinau, Republic of Moldova
  • 2. Chair for Multicomponent Materials, Institute for Materials Science, Kiel University, Kiel, Germany
  • 3. Functional Nanomaterials, Institute for Materials Science, Kiel University, Kiel, Germany
  • 4. PSL University, Chimie ParisTech-CNRS, Institut de Recherche de Chimie Paris, France
  • 5. Institute of Electronic Engineering and Nanotechnology, Chisinau, Republic of Moldova
  • 6. Department of Physics, University of Central Florida, Orlando, USA
  • 7. Institute for Materials Science – Synthesis and Real Structure, Faculty of Engineering, Christian-Albrechts-University of Kiel, Germany

Description

In this study, Ag-doped ZnO (ZnO:Ag) nanostructured films were functionalized with silver nanoparticles (Ag NPs), silver-platinum bimetallic nanoparticles (AgPt NPs) and silver-gold bimetallic NPs (AgAu NPs) using a gas phase PVD process based on a Haberland type gas aggregation cluster source and unipolar DC planar magnetron sputtering. Ultraviolet (UV) sensing investigations showed an respectable time constants reduction for rising and decaying photocurrents, as well as an increase for the UV response. Compared to a pristine nanostructured film the surface functionalization with Ag, AgPt and AgAu increased the UV response by factors of 2.7, 3.5 and 4, respectively. The increased performances of the here presented ZnO:Ag nanostructured films functionalized with monometallic and bimetallic NPs based photodetectors are explained by the increased lifetime of photogenerated electron – hole pairs, as well as the formation of nanoscale Schottky barriers at the interface of Au/ZnO:Ag and Pt/ZnO:Ag.

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