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Atomically Thin Gallium Nitride for High-Performance Photodetection

journal contribution
posted on 2024-10-11, 02:50 authored by SK Jain, N Syed, S Balendhran, Sherif AbbasSherif Abbas, RT Ako, MX Low, C Lobo, A Zavabeti, BJ Murdoch, G Gupta, M Bhaskaran, KB Crozier, SP Russo, T Daeneke, S Walia
AbstractGallium nitride (GaN) technology has matured and commercialised for optoelectronic devices in the ultraviolet (UV) spectrum over the last few decades. Simultaneously, atomically thin materials with unique features have emerged as contenders for device miniaturization. However, the lack of successful techniques to produce ultra‐thin GaN prevents access to these new predicted properties. Here, this important gap is addressed by printing millimeter‐large ultra‐thin GaN nanosheets (NS) (≈1.4 nm) using a simple two‐step process that simultaneously introduces nitrogen point defects. This extends the photoelectrical spectral response from UV (280 nm) to near infrared (NIR) (1080 nm). The GaN‐based photodetectors display excellent figures of merit, having a responsivity (2.72 × 104 A W−1) up to four orders of magnitude higher than the commercial photodetectors at room temperature, despite being 102–103 times thinner. The photodetectors exhibit fast switching, with rise and decay time in the range of microseconds. The state‐of‐the‐art device performance originates from the ultra‐thin nature of GaN NS coupled with nitrogen point vacancies in the synthesis process. This work presents the opportunity to significantly expand the reach of GaN semiconductor technology and may lead to applications in high‐performance miniaturized imaging systems, spectroscopy, communication, and integrated optoelectronic circuits.

History

Journal

Advanced Optical Materials

Volume

11

Article number

2300438

Pagination

1-11

Location

London, Eng.

Open access

  • No

ISSN

2195-1071

eISSN

2195-1071

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Issue

15

Publisher

Wiley

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