Highly Responsive Ultraviolet Sensor Based on ZnS Quantum Dot Solid with Enhanced Photocurrent

Detection of visible blind UV radiation is not only interesting but also of technologically important. Herein, we demonstrate the efficient detection of UV radiation by using cluster like ZnS quantum dot solid nanostructures prepared by simple reflux condensation technique. The short-chain ligand 3-...

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Bibliographic Details
Published in:Scientific reports 2019-12, Vol.9 (1), p.18704-14, Article 18704
Main Authors: Premkumar, Sellan, Nataraj, Devaraj, Bharathi, Ganapathi, Ramya, Subramaniam, Thangadurai, T. Daniel
Format: Article
Language:English
Subjects:
140/133
639/624/399/1017
639/925/918/1054
Humanities and Social Sciences
Hybrids
Light sources
multidisciplinary
Quantum dots
Science
Science (multidisciplinary)
Ultraviolet radiation
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Summary:Detection of visible blind UV radiation is not only interesting but also of technologically important. Herein, we demonstrate the efficient detection of UV radiation by using cluster like ZnS quantum dot solid nanostructures prepared by simple reflux condensation technique. The short-chain ligand 3-mercaptopropionic acid (MPA) involved in the synthesis lead to the cluster like formation of ZnS quantum dots into solids upon prolonged synthesis conditions. The ZnS QD solid formation resulted in the strong delocalization of electronic wave function between the neighboring quantum dots. It increases the photocurrent value, which can be further confirmed by the decrease in the average lifetime values from 64 to 4.6 ns upon ZnS cluster like QD solid formation from ZnS QDs. The ZnS quantum dot solid based UV sensor shows good photocurrent response and a maximum responsivity of 0.31 (A/W) at a wavelength of 390 nm, is not only competitive when compared with previous reports but also better than ZnS and metal oxide-based photodetectors. The device exhibits a high current value under low-intensity UV light source and an on/off ratio of I UV /I dark  = 413 at zero biasing voltage with a fast response. Further, photocurrent device has been constructed using ZnS quantum dot solid nanostructures with graphene hybrids as an active layer to improve the enhancement of photoresponsivity.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-55097-8