Spectrum Selectivity and Responsivity of ZnO Nanoparticles Coated Ag/ZnO QDs/Ag UV Photodetectors

Photoresponsivity and spectrum selectivity of ZnO nanoparticles (NPs)-coated colloidal quantum dots (CQDs)-based Ag/ZnO QDs/Ag interdigitated metal-semiconductor-metal (MSM) photodetectors under front and back illuminations have been investigated in this letter. It is shown that the ZnO NPs film coa...

Full description

Saved in:
Bibliographic Details
Published in:IEEE photonics technology letters 2018-06, Vol.30 (12), p.1147-1150
Main Authors: Kumar, Yogesh, Kumar, Hemant, Rawat, Gopal, Kumar, Chandan, Pal, Bhola N., Jit, Satyabrata
Format: Article
Language:English
Subjects:
Absorption
Electrodes
II-VI semiconductor materials
Illumination
Lighting
Nanoparticles
Photodetectors
Photometers
Quantum dots
responsivity
Scattering
Selectivity
Silver
spectrum selectivity
Zinc oxide
ZnO QDs
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Photoresponsivity and spectrum selectivity of ZnO nanoparticles (NPs)-coated colloidal quantum dots (CQDs)-based Ag/ZnO QDs/Ag interdigitated metal-semiconductor-metal (MSM) photodetectors under front and back illuminations have been investigated in this letter. It is shown that the ZnO NPs film coated over the interdigitated MSM photodetector acts as a filter layer to enhance the spectrum selectivity at the cost of reduced responsivity of the detector under front illumination. Whereas, the same NPs layer acts as a scattering medium to enhance the responsivity at the cost of reduced selectivity of the detector under back illumination condition. The measured responsivity under front illumination is 6 A/W with a full width at half maxima (FWHM) of ~25 nm, whereas it is increased to 20 A/W with an FWHM of ~49 nm under back illumination at an applied bias of 2 V. Thus, the ZnO NPs layer can be used to optimize the photoresponse characteristics of the ZnO CQDs-based MSM photodetector by changing the direction of illumination on the device.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2018.2836978