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Radiometric characterization of type-II InAs/GaSb superlattice (t2sl) midwave infrared photodetectors and focal plane arrays

Sodnik, Zoran, Cugny, Bruno, Karafolas, Nikos, Ribet-Mohamed, I., Martijn, H., Caes, M., Rodriguez, J. B., Giard, E., Nghiem, Jean, Costard, E., Christol, P. and Delmas, Marie ORCID: 2017. Radiometric characterization of type-II InAs/GaSb superlattice (t2sl) midwave infrared photodetectors and focal plane arrays. Presented at: International Conference on Space Optics — ICSO 2016, Biarritz, France, 18 - 21 October 2016. International Conference on Space Optics. , vol.10562 Proceedings of SPIE, p. 24. 10.1117/12.2296053

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In recent years, Type-II InAs/GaSb superlattice (T2SL) has emerged as a new material technology suitable for high performance infrared (IR) detectors operating from Near InfraRed (NIR, 2-3μm) to Very Long Wavelength InfraRed (LWIR, λ > 15μm) wavelength domains. To compare their performances with well-established IR technologies such as MCT, InSb or QWIP cooled detectors, specific electrical and radiometric characterizations are needed: dark current, spectral response, quantum efficiency, temporal and spatial noises, stability… In this paper, we first present quantum efficiency measurements performed on T2SL MWIR (3-5μm) photodiodes and on one focal plane array (320x256 pixels with 30μm pitch, realized in the scope of a french collaboration ). Different T2SL structures (InAs-rich versus GaSb-rich) with the same cutoff wavelength (λc= 5μm at 80K) were studied. Results are analysed in term of carrier diffusion length in order to define the optimum thickness and type of doping of the absorbing zone. We then focus on the stability over time of a commercial T2SL FPA (320x256 pixels with 30μm pitch), measuring the commonly used residual fixed pattern noise (RFPN) figure of merit. Results are excellent, with a very stable behaviour over more than 3 weeks, and less than 10 flickering pixels, possibly giving access to long-term stability of IR absolute calibration.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: Proceedings of SPIE
ISSN: 0277-786X
Date of First Compliant Deposit: 22 December 2017
Date of Acceptance: 25 September 2017
Last Modified: 03 Nov 2022 10:21

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