Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 33, Issue 19, Pages 1065-1068Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2021.3103097
Keywords
Photodetectors (PDs); hydrothermal growth; zinc oxide
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The study presented completely solution-processed Ag-ZnO nanostructures for highly selective, visible-blind, and stable UV photodetector development. The Ag-decorated ZnO exhibited significant improvements in current leakage, photosensitivity, and UV to visible rejection ratio, showing potential for replacing complex and costly synthesis processes.
In this work, we have reported completely solutionprocessed Ag-ZnO nanostructures towards the development of highly selective, visible-blind and stable UV photodetector. The Ag nanoparticles were deposited over ZnO nanostructures via photochemical reduction process. Comparing to pristine ZnO, the Ag decorated ZnO has demonstrated significant suppression in the leakage current from 9.83 x 10(-11) A to 7.16 x 10(-12) A at an applied bias of 10 V. The photosensitivity has been improved from 7.6 x 10(5) to 2.2 x 10(6) at 330 nm wavelength. Moreover, the UV to visible rejection ratio (R-(330nm)/R-(650nm)) is enhanced from 67 to 1.1 x 10(4) . The fabricated Ag-ZnO nanostructured device showed stable response under UV illumination with improved rise time and fall time of 30 s and 65 s, respectively. The work has immense potential to replace the existing complex and costly device synthesis processes with simple and cost-effective solution-based approach to develop highly reliable and visible blind UV photodetectors.
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