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

Sellan Premkumar^1,2,3, Devaraj Nataraj^4,5, Ganapathi Bharathi⁶

¹Quantum Materials and Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India. sivajiisro@gmail.com.

Scientific Reports

|December 12, 2019

Summary

We developed a novel UV sensor using cluster-like Zinc Sulfide (ZnS) quantum dot solids. This efficient sensor shows high photocurrent and fast response for detecting UV radiation.

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Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Visible-blind ultraviolet (UV) radiation detection is crucial for various technological applications.
Quantum dots (QDs) offer unique optoelectronic properties for sensing applications.

Purpose of the Study:

To demonstrate efficient UV radiation detection using cluster-like ZnS quantum dot solid nanostructures.
To investigate the effect of QD solid formation on photocurrent and response time.

Main Methods:

Synthesis of ZnS quantum dots using a reflux condensation technique with 3-mercaptopropionic acid (MPA) as a ligand.
Formation of cluster-like ZnS QD solids through prolonged synthesis.
Fabrication and characterization of a UV sensor device based on ZnS QD solids.

Main Results:

ZnS QD solid formation led to strong electronic wave function delocalization and increased photocurrent.
Average lifetime decreased from 64 to 4.6 ns upon ZnS QD solid formation.
The UV sensor exhibited a responsivity of 0.31 A/W at 390 nm, with a high on/off ratio (413) and fast response.

Conclusions:

Cluster-like ZnS quantum dot solids are effective for efficient UV detection.
The developed ZnS QD solid-based UV sensor outperforms existing ZnS and metal oxide photodetectors.
Graphene hybridization further enhances the photoresponsivity of the ZnS QD solid nanostructures.