A highly sensitive, large area, and self-powered UV photodetector based on coalesced gallium nitride nanorods/graphene/silicon (111) heterostructure

Nur 'Adnin Akmar Zulkifli, Kwangwook Park, Jung-Wook Min, Boon S. Ooi, Rozalina Zakaria, Jongmin Kim, Chee Leong Tan

Research output: Contribution to journalArticlepeer-review

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Abstract

In this paper, we demonstrate an ultraviolet photodetector (UV-PD) that uses coalesced gallium nitride (GaN) nanorods (NRs) on a graphene/Si (111) substrate grown by plasma-assisted molecular beam epitaxy. We report a highly sensitive, self-powered, and hybrid GaN NR/graphene/Si (111) PD with a relatively large 100 mm2 active area, a high responsivity of 17.4 A/W, a high specific detectivity of 1.23 1013 Jones, and fast response speeds of 13.2/13.7 ls (20 kHz) under a UV light of 355 nm at zero bias voltage. The results show that the thin graphene acts as a perfect interface for GaN NRs, encouraging growth with minimum defects on the Si substrate. Our results suggest that the GaN NR/graphene/Si (111) heterojunction has a range of interesting properties that make it well-suited for a variety of photodetection applications.
Original languageEnglish (US)
Pages (from-to)191103
JournalApplied Physics Letters
Volume117
Issue number19
DOIs
StatePublished - Nov 13 2020

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