Barrier InAsSb/B-AlSb LWIR detector for FSO: theoretical assessment

P. Martyniuk; M. Kopytko; E. Gomółka; J. Mikołajczyk

doi:10.1117/12.2518849

7 May 2019 Barrier InAsSb/B-AlSb LWIR detector for FSO: theoretical assessment

P. Martyniuk, M. Kopytko, E. Gomółka, J. Mikołajczyk

Proceedings Volume 11002, Infrared Technology and Applications XLV; 110022E (2019) https://doi.org/10.1117/12.2518849
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

InAsSb ternary alloy is considered to be an alternative to HgCdTe (MCT) in long-wavelength infrared (LWIR) spectral region. The high operation temperature conditions are successfully reached with A^IIIB^V bariodes, where InAsSb/AlAsSb system is playing dominant role. Since theoretically there is no depletion region in the active layer, the generation-recombination and trap-assisted tunneling mechanisms are suppressed leading to lower dark currents in comparison with standard photodiodes. As a consequence, the bariodes operate at a higher temperature than standard photodiodes which could be used in wide range of system applications, especially where the size, weight, and power consumption are crucial, to include - Free Space Optics (FSO) system. In terms of FSO the LWIR provides limited scattering and atmosphere turbulence in comparison to the commonly used ~ 1550 nm range. Currently, as reported HgCdTe LWIR with peak wavelength ~ 10 μm exhibiting ~ 9×10⁹ cmHz^1/2/W (unbiased) and ~ 3×10¹⁰ cmHz^1/2/W (200 mV) and response time 0.3-4 ns are used. The paper presents detailed analysis of the bariode’s performances (such as dark current, detectivity and response time) versus applied voltage, operating wavelength, temperatures (4-, 2- stage thermoelectrical cooling) and structural parameters (active layer Sb composition, x_Sb). The optimal working conditions are simulated (non-equilibrium). Theoretical predictions of bariode’s performances are compared with experimental data published for commonly used FSO HgCdTe detectors.

Citation Download Citation

P. Martyniuk, M. Kopytko, E. Gomółka, and J. Mikołajczyk "Barrier InAsSb/B-AlSb LWIR detector for FSO: theoretical assessment", Proc. SPIE 11002, Infrared Technology and Applications XLV, 110022E (7 May 2019); https://doi.org/10.1117/12.2518849

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KEYWORDS

Sensors

Long wavelength infrared

Antimony

Free space optics

Mercury cadmium telluride

Mid-IR

Gallium arsenide

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