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Proceedings Paper

T2SL development for space at IRnova: from eSWIR to VLWIR
Author(s): Ruslan Ivanov; Linda Höglund; David Ramos; Shagufta Naureen; Maxime Pozzi; Susanne Almqvist; Smilja Becanovic; David Rihtnesberg; Pia Tinghag; Anton Smuk; Saad Fattala; Sergiy Smuk; Marie Delmas; Eric Costard
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Paper Abstract

In this paper, results from the development of InAs/GaSb superlattice focal plane arrays (FPAs) at IRnova will be presented. A versatile and robust detector design is used that allows for adjustment of the detection cut-off wavelength from 2.5 μm up to 14.5 μm with only minor changes in the detector design. Performance of the fabricated detectors has been reviewed in terms of external quantum efficiency (EQE), dark current and noise for three designs with cut-off wavelengths of 4, 5.5 and 11 μm at 80 K (referred to as DEEP BLUE, RED HOT and VLWIR, respectively). Measurements on the 15 μm sized photodiodes demonstrated 70% EQE for the MWIR designs, and almost 40% - for VLWIR. At the same time, the dark current stayed close to the Rule07 benchmark for all studied samples. Noise mechanisms have been discussed and their relation to the passivation was examined. Mature in-house processing and passivation technique of resulted in very high spatial uniformity of VGA focal plane arrays (FPAs), i.e. low relative deviations of EQE (< 6%) and of dark current density (< 12%) and narrow noise distributions for both RED HOT and DEEP BLUE FPAs. We show also that <99.5% of these arrays operate close to the fundamental noise limit.

Paper Details

Date Published: 10 October 2019
PDF: 9 pages
Proc. SPIE 11151, Sensors, Systems, and Next-Generation Satellites XXIII, 1115111 (10 October 2019); doi: 10.1117/12.2533247
Show Author Affiliations
Ruslan Ivanov, IRnova AB (Sweden)
Linda Höglund, IRnova AB (Sweden)
David Ramos, IRnova AB (Sweden)
KTH Royal Institute of Technology (Sweden)
Shagufta Naureen, IRnova AB (Sweden)
Maxime Pozzi, IRnova AB (Sweden)
Susanne Almqvist, IRnova AB (Sweden)
Smilja Becanovic, IRnova AB (Sweden)
David Rihtnesberg, IRnova AB (Sweden)
Pia Tinghag, IRnova AB (Sweden)
Anton Smuk, IRnova AB (Sweden)
Saad Fattala, IRnova AB (Sweden)
Sergiy Smuk, IRnova AB (Sweden)
Marie Delmas, IRnova AB (Sweden)
Eric Costard, IRnova AB (Sweden)

Published in SPIE Proceedings Vol. 11151:
Sensors, Systems, and Next-Generation Satellites XXIII
Steven P. Neeck; Philippe Martimort; Toshiyoshi Kimura, Editor(s)

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