Dual-functional ultraviolet photodetector with graphene electrodes on AlGaN/GaN heterostructure

Abstract A dual-functional ultraviolet (UV) photodetector with a large UV-to-visible rejection ratio is presented, in which interdigitated finger-type two-dimensional graphene electrodes are introduced to an AlGaN/GaN heterostructure. Two photocurrent generation mechanisms of photovoltaic and photoc...

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Autores principales:	Bhishma Pandit, E. Fred Schubert, Jaehee Cho
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0e0c4535cf074727811785f75ac066fe
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spelling	oai:doaj.org-article:0e0c4535cf074727811785f75ac066fe2021-12-02T12:42:28ZDual-functional ultraviolet photodetector with graphene electrodes on AlGaN/GaN heterostructure10.1038/s41598-020-79135-y2045-2322https://doaj.org/article/0e0c4535cf074727811785f75ac066fe2020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79135-yhttps://doaj.org/toc/2045-2322Abstract A dual-functional ultraviolet (UV) photodetector with a large UV-to-visible rejection ratio is presented, in which interdigitated finger-type two-dimensional graphene electrodes are introduced to an AlGaN/GaN heterostructure. Two photocurrent generation mechanisms of photovoltaic and photoconductive dominances coexist in the device. The dominance of the mechanisms changes with the induced bias voltage. Below a threshold voltage, the device showed fairly low responsivities but fast response times, as well as a constant photocurrent against the induced bias. However, the opposite characteristics appeared with high bias voltage. Specifically, above the threshold voltage, the device showed high responsivities with additional gain, but slow rise and recovery times. For instance, the responsivity of 10.9 A/W was observed with the gain of 760 at the induced bias voltage of 5 V. This unique multifunctionality enabled by the combination of an AlGaN/GaN heterostructure with graphene electrodes facilitates the development of a single device that can achieve multiple purposes of photodetection.Bhishma PanditE. Fred SchubertJaehee ChoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-7 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bhishma Pandit E. Fred Schubert Jaehee Cho Dual-functional ultraviolet photodetector with graphene electrodes on AlGaN/GaN heterostructure
description	Abstract A dual-functional ultraviolet (UV) photodetector with a large UV-to-visible rejection ratio is presented, in which interdigitated finger-type two-dimensional graphene electrodes are introduced to an AlGaN/GaN heterostructure. Two photocurrent generation mechanisms of photovoltaic and photoconductive dominances coexist in the device. The dominance of the mechanisms changes with the induced bias voltage. Below a threshold voltage, the device showed fairly low responsivities but fast response times, as well as a constant photocurrent against the induced bias. However, the opposite characteristics appeared with high bias voltage. Specifically, above the threshold voltage, the device showed high responsivities with additional gain, but slow rise and recovery times. For instance, the responsivity of 10.9 A/W was observed with the gain of 760 at the induced bias voltage of 5 V. This unique multifunctionality enabled by the combination of an AlGaN/GaN heterostructure with graphene electrodes facilitates the development of a single device that can achieve multiple purposes of photodetection.
format	article
author	Bhishma Pandit E. Fred Schubert Jaehee Cho
author_facet	Bhishma Pandit E. Fred Schubert Jaehee Cho
author_sort	Bhishma Pandit
title	Dual-functional ultraviolet photodetector with graphene electrodes on AlGaN/GaN heterostructure
title_short	Dual-functional ultraviolet photodetector with graphene electrodes on AlGaN/GaN heterostructure
title_full	Dual-functional ultraviolet photodetector with graphene electrodes on AlGaN/GaN heterostructure
title_fullStr	Dual-functional ultraviolet photodetector with graphene electrodes on AlGaN/GaN heterostructure
title_full_unstemmed	Dual-functional ultraviolet photodetector with graphene electrodes on AlGaN/GaN heterostructure
title_sort	dual-functional ultraviolet photodetector with graphene electrodes on algan/gan heterostructure
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/0e0c4535cf074727811785f75ac066fe
work_keys_str_mv	AT bhishmapandit dualfunctionalultravioletphotodetectorwithgrapheneelectrodesonalganganheterostructure AT efredschubert dualfunctionalultravioletphotodetectorwithgrapheneelectrodesonalganganheterostructure AT jaeheecho dualfunctionalultravioletphotodetectorwithgrapheneelectrodesonalganganheterostructure
_version_	1718393666963243008

Dual-functional ultraviolet photodetector with graphene electrodes on AlGaN/GaN heterostructure

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