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Proceedings Paper

Thermal stability of contacts on AlGaN-Based UV photodetectors
Author(s): Kamarulazizi Ibrahim; Ali Abadi Aljubouri; Yan Cheung Lee; Zainuriah Hassan; Md. Roslan Hashim
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Paper Abstract

The III-V nitrides (GaN and AlGaN) wide band gap semiconductors have been recognized recently as a very important technological material system for fabricating optoelectronic devices operating in the blue/ultraviolet (UV) spectral region and electronic devices capable of operating under high-power and high-temperature conditions. These materials are remarkably tolerant to aggressive environments, due to its thermal stability and radiation hardness and are excellent photodetector materials to cover the 240-360 nm range. A key advantage of III-nitrides detectors over competing devices based on semiconductors with smaller bandgaps is the long wavelength response cut-off, which is directly related to the bandgap of the material in the active region and thus does not require external filters. Metal-semiconductor-metal (MSM) photodiodes are of interest for many applications because of their relatively simple fabrication process, low dark currents, low noise, and fast response time. In this work, AlGaN-based MSM photodetectors with nickel (Ni) Schottky contacts were fabricated and characterized. A comparative study of the photodiodes characteristics were carried out. The thermal stability of the contacts at various annealing temperatures (300°C-700°C) was investigated. Cryogenic cooling after heat treatment was also performed to determine the effects of this treatment on the electrical characteristics of the devices. Electrical characterization was performed by current-voltage (I-V) measurement to investigate the Schottky contact properties of the photodetectors.

Paper Details

Date Published: 8 June 2004
PDF: 9 pages
Proc. SPIE 5353, Semiconductor Photodetectors, (8 June 2004); doi: 10.1117/12.529002
Show Author Affiliations
Kamarulazizi Ibrahim, Univ. Sains Malaysia (Malaysia)
Ali Abadi Aljubouri, Univ. Sains Malaysia (Malaysia)
Yan Cheung Lee, Univ. Sains Malaysia (Malaysia)
Zainuriah Hassan, Univ. Sains Malaysia (Malaysia)
Md. Roslan Hashim, Univ. Sains Malaysia (Malaysia)

Published in SPIE Proceedings Vol. 5353:
Semiconductor Photodetectors
Kurt J. Linden; Eustace L. Dereniak, Editor(s)

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