Journal ArticleDOI
AlGaN metal–semiconductor–metal photodiodes
TLDR
In this paper, the fabrication and characterization of AlGaN metal-semiconductor-metal photodiodes with sharp cutoff wavelengths from 365 to 310 nm was described, with an ultraviolet/visible contrast of about 4 orders of magnitude.Abstract:
We report on the fabrication and characterization of AlGaN metal–semiconductor–metal photodiodes with sharp cutoff wavelengths from 365 to 310 nm. The detectors are visible blind, with an ultraviolet/visible contrast of about 4 orders of magnitude. The photocurrent scales linearly with optical power for photon energies both over and below the band gap, supporting the absence of photoconductive gain related to space-charge regions. No persistent photoconductivity effects have been detected. Time response is limited by the RC product of the measurement system, the transit time of the device being far below 10 ns. The normalized noise equivalent power at 28 V bias is lower than 17 pW/Hz1/2 in GaN detectors, and about 24 pW/Hz1/2 in Al0.25Ga0.75N photodiodes.read more
Citations
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Journal ArticleDOI
Wide-bandgap semiconductor ultraviolet photodetectors
TL;DR: In this paper, a general review of the advances in widebandgap semiconductor photodetectors is presented, including SiC, diamond, III-nitrides and ZnS.
Journal ArticleDOI
AlGaN photonics: recent advances in materials and ultraviolet devices
TL;DR: In this article, a review of the progress in AlGaN-based UV LEDs, EB-pumped light sources, LDs, PDs, passive devices, and nonlinear optical properties are presented.
Journal ArticleDOI
Fabrication and photoresponse of a pn-heterojunction diode composed of transparent oxide semiconductors, p-NiO and n-ZnO
Hiromichi Ohta,Masahiro Hirano,Ken Nakahara,Hideaki Maruta,Tetsuhiro Tanabe,Masao Kamiya,Toshio Kamiya,Hideo Hosono +7 more
TL;DR: In this paper, a transparent trilayered oxide films of ZnO/NiO/indium tin oxide were heteroepitaxially grown on a YSZ (111) substrate by pulsed-laser deposition combined with a solid-phaseepitaxy technique.
Journal ArticleDOI
Transparent Oxide Optoelectronics
Hiromichi Ohta,Hideo Hosono +1 more
TL;DR: In this paper, a review of transparent oxide optoelectronic devices based on their efforts focusing on transparent thin-film transistors fabricated from single-crystalline films of InGaO3(ZnO)5 with a natural superlattice structure is presented.
Journal ArticleDOI
Gain mechanism in GaN Schottky ultraviolet detectors
TL;DR: In this article, a unified description of the gain mechanism in GaN Schottky detectors is presented, which is valid for all device structures under study, and represents a unified model for all devices under study.
References
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Book
Semiconductor Optoelectronic Devices
TL;DR: In this article, the properties of semiconductors and their properties are investigated in the context of light-emitting diodes, solar cells, and opto-electronic integrated circuits.
Journal ArticleDOI
High speed, low noise ultraviolet photodetectors based on GaN p-i-n and AlGaN(p)-GaN(i)-GaN(n)structures
G. Y. Xu,Arnel Salvador,Wook Kim,Z. Fan,Changzhi Lu,Haipeng Tang,Hadis Morkoç,G. Smith,Michael John Estes,B. Goldenberg,W. Yang,S. Krishnankutty +11 more
TL;DR: In this article, the spectral response of front-surface-illuminated GaN and AlGaN/GaN p-i-n ultraviolet photodetectors prepared by reactive molecular beam epitaxy on sapphire substrates was investigated.
Journal ArticleDOI
Photoconductive gain modelling of GaN photodetectors
TL;DR: In this paper, a model to explain the behavior of GaN photoconductive detectors is proposed, and it is based on the idea of a volume modulation rather than a carrier density modulation.
Journal ArticleDOI
Photoconductor gain mechanisms in gan ultraviolet detectors
E. Muñoz,Eva Monroy,Jose A. Garrido,I. Izpura,F. J. Sánchez,Miguel Sanchez-Garcia,E. Calleja,Bernard Beaumont,Pierre Gibart +8 more
Abstract: GaN photoconductive detectors have been fabricated on sapphire substrates by metal organic vapor phase epitaxy and gas-source molecular beam epitaxy on Si (111) substrates. The photodetectors showed high photoconductor gains, a very nonlinear response with illuminating power, and an intrinsic nonexponential photoconductance recovery process. A novel photoconductor gain mechanism is proposed to explain such results, based on a modulation of the conductive volume of the layer.
Journal ArticleDOI
High-speed, low-noise metal–semiconductor–metal ultraviolet photodetectors based on GaN
D. Walker,Eva Monroy,Eva Monroy,Patrick Kung,Jinsong Wu,M. Hamilton,F. J. Sanchez,F. J. Sanchez,Jacqueline E. Diaz,Manijeh Razeghi +9 more
TL;DR: In this paper, the fabrication and characterization of nonintentionally doped GaN and GaN:Mg Schottky photodetectors, grown on sapphire by metalorganic chemical vapor deposition, were presented.