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Proceedings Paper

High-performance solar-blind AlGaN photodetectors
Author(s): Ekmel Ozbay; Turgut Tut; Necmi Biyikli
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Paper Abstract

Design, fabrication, and characterization of high-performance AlxGa1-xN-based photodetectors for solar-blind applications are reported. AlxGa1-xN heterostructures were designed for Schottky, p-i-n, and metal-semiconductor-metal (MSM) photodiodes. The solar-blind photodiode samples were fabricated using a microwave compatible fabrication process. The resulting devices exhibited extremely low dark currents. Below 3 fA leakage currents at 6 V and 12 V reverse bias were measured on p-i-n and Schottky photodiode samples respectively. The excellent current-voltage (I-V) characteristics led to a detectivity performance of 4.9x1014 cmHz1/2/W-1. The MSM devices exhibited photoconductive gain, while Schottky and p-i-n samples displayed 0.15 A/W and 0.11 A/W peak responsivity values at 267 nm and 261 nm respectively. All samples displayed true solar-blind response with cut-off wavelengths smaller than 280 nm. A visible rejection of 4x104 was achieved with Schottky detector samples. High speed measurements at 267 nm resulted in fast pulse responses with >GHz bandwidths. The fastest devices were MSM photodiodes with a maximum 3-dB bandwidth of 5.4 GHz.

Paper Details

Date Published: 25 March 2005
PDF: 14 pages
Proc. SPIE 5732, Quantum Sensing and Nanophotonic Devices II, (25 March 2005); doi: 10.1117/12.582491
Show Author Affiliations
Ekmel Ozbay, Bilkent Univ. (Turkey)
Turgut Tut, Bilkent Univ. (Turkey)
Necmi Biyikli, Virginia Commonwealth University (United States)

Published in SPIE Proceedings Vol. 5732:
Quantum Sensing and Nanophotonic Devices II
Manijeh Razeghi; Gail J. Brown, Editor(s)

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