InGaAsSb for cut-off tuned SWIR detectors

Katarina Mamic; Andrew Bainbridge; Laura A. Hanks; Adam P. Craig; Andrew R. J. Marshall

doi:10.1117/12.2650772

15 March 2023 InGaAsSb for cut-off tuned SWIR detectors

Katarina Mamic, Andrew Bainbridge, Laura A. Hanks, Adam P. Craig, Andrew R. J. Marshall

Proceedings Volume 12430, Quantum Sensing and Nano Electronics and Photonics XIX; 124300O (2023) https://doi.org/10.1117/12.2650772
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

We investigate the characteristics of the quaternary alloy In_xGa_1−xAs_ySb_1−y as a viable alternative to extended InGaAs for sensing in short wavelength infrared. In_xGa_1−xAs_ySb_1−y p-i-n photodetectors with 0 < x < 0.3 have been grown on GaSb substrates in the wavelength region between 1 - 3 µm. Absorption coefficient up to ∼ 10⁴ cm⁻¹ compares well with that of InGaAs, increasing for samples with narrower bandgaps. Capacitance measurements shed light on the intrinsic unintentional doping levels, which are up to an order of magnitude lower than in typical bulk GaSb, due to a reduction in native defects of the material. Current density initially decreases with addition of small fractions of In/As to GaSb, then proceeds to increase once again towards higher alloy fractions as the bandgap narrows.

Conference Presentation

Citation Download Citation

Katarina Mamic, Andrew Bainbridge, Laura A. Hanks, Adam P. Craig, and Andrew R. J. Marshall "InGaAsSb for cut-off tuned SWIR detectors", Proc. SPIE 12430, Quantum Sensing and Nano Electronics and Photonics XIX, 124300O (15 March 2023); https://doi.org/10.1117/12.2650772

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