p-(001)NiO/n-(0001)ZnO Heterostructures based Ultraviolet Photodetectors

We investigate the potential of epitaxial (001)p-NiO/(0001)n-ZnO heterostructures grown on (0001)sapphire substrates by pulsed laser deposition technique for ultraviolet photodetector application. Our study reveals that in the self-powered mode, these devices can serve as effective photodetectors fo...

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Bibliographic Details
Published in:arXiv.org 2024-09
Main Authors: Kaur, Amandeep, Bhabani Prasad Sahu, Biswas, Ajoy, Dhar, Subhabrata
Format: Article
Language:English
Subjects:
Bias
Epitaxial growth
Heterostructures
Nickel oxides
Photoconductivity
Photometers
Pulsed laser deposition
Pulsed lasers
Response time
Sapphire
Substrates
Ultraviolet detectors
Zinc oxide
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Summary:We investigate the potential of epitaxial (001)p-NiO/(0001)n-ZnO heterostructures grown on (0001)sapphire substrates by pulsed laser deposition technique for ultraviolet photodetector application. Our study reveals that in the self-powered mode, these devices can serve as effective photodetectors for the UV-A band (320-400 nm) with response time as short as 400 microseconds. Peak responsivity as high as 5mA/W at zero bias condition have been achieved. These devices also show a very high level of stability under repeated on/off illumination cycles over a long period of time. Furthermore, we find that the response time of these detectors can be controlled from several microseconds to thousands of seconds by applying bias both in the forward and the reverse directions. This persistent photoconductivity effect has been explained in terms of the field induced change in the capture barrier height associated with certain traps located at the junction.
ISSN:2331-8422