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Proceedings Paper

Growth and characterization of GaN/AlGaN heterostructures on GaN substrate templates
Author(s): Lance Hubbard; Nikolaus Dietz; Mark Vernon; Ramon Collazo; Seiji Mita; Ronny Kirste; Zlatko Sitar; Vincent T. Woods
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Paper Abstract

This contribution will present the structural and optoelectronic properties of GaN/AlGaN heterostructures grown by Metal Organic Chemical Vapor Deposition (MOCVD) on GaN/sapphire templates. The target parameters for the materials heterostructures have been modeled for utilization in Avalanche Photodiode Detector Structures (APD) operating in the near and deep UV region. Optical modeling has improved absorption within the heterojunction as well as maximized light trapping within the device. Electronic modeling has determined the optimal dopant concentrations for maximum impact ionization rate, as well as tolerance to defects and unintentional doping. This application will require advances in the defect densities, surface morphology, and interfaces. Surface morphological and structural properties of GaN/AlGaN heterostructures are analyzed by Atomic Force Microscopy, Raman spectroscopy, and X-ray diffraction. The optoelectronic properties (phonon structures, free carrier concentrations, and carrier mobility) as well as layer thickness information, are determined by Fourier Transform Infrared Reflectance spectroscopy. A correlation of interfacial defects (type and concentration) with microscopic structural properties, surface morphology, and optoelectronic properties (free carrier concentration and high-frequency dielectric function) is discussed.

Paper Details

Date Published: 10 October 2017
PDF: 11 pages
Proc. SPIE 10378, Sixteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 103780D (10 October 2017); doi: 10.1117/12.2274932
Show Author Affiliations
Lance Hubbard, Pacific Northwest National Lab. (United States)
Nikolaus Dietz, Georgia State Univ. (United States)
Mark Vernon, Georgia State Univ. (United States)
Ramon Collazo, North Carolina State Univ. (United States)
Seiji Mita, North Carolina State Univ. (United States)
Ronny Kirste, North Carolina State Univ. (United States)
Zlatko Sitar, North Carolina State Univ. (United States)
Vincent T. Woods, Pacific Northwest National Lab. (United States)

Published in SPIE Proceedings Vol. 10378:
Sixteenth International Conference on Solid State Lighting and LED-based Illumination Systems
Nikolaus Dietz; Ian T. Ferguson, Editor(s)

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