Photoresponse Characteristics of a Graphene Quantum Dot/GaN Metal–Semiconductor–Metal Ultraviolet Photodetector

IF 2.7 4区 材料科学 Q3 CHEMISTRY, PHYSICAL
Bhishma Pandit, Jaehee Cho
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引用次数: 0

Abstract

In this study, the contact characteristics of graphene quantum dots (GQDs) formed on n‐type GaN semiconductors are investigated. Blue‐luminescent GQDs prepared using a hydrothermal method are sprayed onto a GaN wafer, and the electrical and optical properties of the fabricated contacts are investigated. The GQD/GaN contacts exhibit rectifying behavior with a typical Schottky barrier height of 0.64 eV. A metal–semiconductor–metal (MSM) photodiode with interdigitated GQD contacts on n‐type GaN is fabricated and provides an extremely low dark current. The spectral photoresponse of the GQD/GaN MSM photodiode includes a sharp increase in responsivity at wavelengths shorter than 375 nm. The responsivity of the MSM photodiode is remarkably improved with increasing the GQD reduction temperature (up to 800 °C), showing a good photoresponse in the ultraviolet region.
石墨烯量子点/氮化镓金属-半导体-金属紫外线光电探测器的光响应特性
本研究调查了在 n 型氮化镓半导体上形成的石墨烯量子点 (GQD) 的接触特性。采用水热法制备的蓝光石墨烯量子点被喷涂到氮化镓晶片上,并对所制备触点的电学和光学特性进行了研究。GQD/GaN 触点表现出整流行为,典型的肖特基势垒高度为 0.64 eV。在 n 型氮化镓上制造出了一种带有相互咬合 GQD 触点的金属-半导体-金属 (MSM) 光电二极管,并提供了极低的暗电流。GQD/GaN MSM 光电二极管的光谱光响应包括在波长短于 375 纳米时响应率的急剧增加。随着 GQD 还原温度的升高(高达 800 °C),MSM 光电二极管的响应率显著提高,在紫外区显示出良好的光响应。
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来源期刊
Particle & Particle Systems Characterization
Particle & Particle Systems Characterization 工程技术-材料科学:表征与测试
CiteScore
5.50
自引率
0.00%
发文量
114
审稿时长
3.0 months
期刊介绍: Particle & Particle Systems Characterization is an international, peer-reviewed, interdisciplinary journal focusing on all aspects of particle research. The journal joined the Advanced Materials family of journals in 2013. Particle has an impact factor of 4.194 (2018 Journal Impact Factor, Journal Citation Reports (Clarivate Analytics, 2019)). Topics covered include the synthesis, characterization, and application of particles in a variety of systems and devices. Particle covers nanotubes, fullerenes, micelles and alloy clusters, organic and inorganic materials, polymers, quantum dots, 2D materials, proteins, and other molecular biological systems. Particle Systems include those in biomedicine, catalysis, energy-storage materials, environmental science, micro/nano-electromechanical systems, micro/nano-fluidics, molecular electronics, photonics, sensing, and others. Characterization methods include microscopy, spectroscopy, electrochemical, diffraction, magnetic, and scattering techniques.
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