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Reduction of dark current and unintentional background doping in InGaAsN photodetectors by ex situ annealing

Tan, SL, Tan, LJJ, Goh, YL, Zhang, S, Ng, JS, David, JPR, Marko, IP, Allam, J, Sweeney, SJ and Adams, AR (2010) Reduction of dark current and unintentional background doping in InGaAsN photodetectors by ex situ annealing In: Optical Sensing and Detection, 2010-04-12 - 2010-04-15, Brussels, Belgium.

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InGaAsN is a promising material system to enable low-cost GaAs-based detectors to operate in the telecommunication spectrum, despite the problems posed by the low growth temperature required for nitrogen incorporation. We demonstrate that InGaAsN p+-i-n+ structures with nominal In and N fraction of 10% and 3.8%, grown by molecular beam epitaxy (MBE) under non-optimal growth conditions, can be optimized by post growth thermal annealing to match the performance of optimally grown structures. We report the findings of an annealing study by comparing the photoluminescence spectra, dark current and background concentration of the as-grown and annealed samples. The dark current of the optimally annealed sample is approximately 2 μA/cm2 at an electric field of 100 kV/cm, and is the lowest reported to date for InGaAsN photodetectors with a cut-off wavelength of 1.3 μm. Evidence of lower unintentional background concentration after annealing at a sufficiently high temperature, is also presented.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Tan, SL
Tan, LJJ
Goh, YL
Zhang, S
Ng, JS
David, JPR
Marko, IP
Allam, J
Sweeney, SJ
Adams, AR
Date : 2010
DOI : 10.1117/12.853912
Contributors :
Additional Information : Copyright 2010 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Depositing User : Symplectic Elements
Date Deposited : 14 Dec 2012 05:55
Last Modified : 31 Oct 2017 14:48

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