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Proceedings Paper

Reduction of dark current and unintentional background doping in InGaAsN photodetectors by ex situ annealing
Author(s): Siew Li Tan; Lionel J. J. Tan; Yu Ling Goh; Shiyong Zhang; Jo Shien Ng; John P. R. David; Igor P. Marko; Jeremy Allam; Stephen J. Sweeney; Alfred R. Adams
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Paper Abstract

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.

Paper Details

Date Published: 13 May 2010
PDF: 8 pages
Proc. SPIE 7726, Optical Sensing and Detection, 77261M (13 May 2010); doi: 10.1117/12.853912
Show Author Affiliations
Siew Li Tan, The Univ. of Sheffield (United Kingdom)
Lionel J. J. Tan, The Univ. of Sheffield (United Kingdom)
Yu Ling Goh, The Univ. of Sheffield (United Kingdom)
Shiyong Zhang, The Univ. of Sheffield (United Kingdom)
Jo Shien Ng, The Univ. of Sheffield (United Kingdom)
John P. R. David, The Univ. of Sheffield (United Kingdom)
Igor P. Marko, Univ. of Surrey (United Kingdom)
Jeremy Allam, Univ. of Surrey (United Kingdom)
Stephen J. Sweeney, Univ. of Surrey (United Kingdom)
Alfred R. Adams, Univ. of Surrey (United Kingdom)

Published in SPIE Proceedings Vol. 7726:
Optical Sensing and Detection
Francis Berghmans; Anna Grazia Mignani; Chris A. van Hoof, Editor(s)

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