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1 /f Noise and Dark Current Correlation in Midwave InAs/GaSb Type‐II Superlattice IR Detectors
Author(s) -
Ramos David,
Delmas Marie,
Ivanov Ruslan,
Höglund Linda,
Costard Eric,
Hellström Per-Erik,
Malm Gunnar
Publication year - 2021
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202000557
Subject(s) - dark current , superlattice , physics , noise (video) , noise power , spectral density , condensed matter physics , quantum tunnelling , spectral line , diffusion , noise spectral density , detector , optoelectronics , optics , noise figure , power (physics) , amplifier , statistics , mathematics , cmos , quantum mechanics , astronomy , artificial intelligence , computer science , image (mathematics) , thermodynamics
Herein, results from noise and dark current density studies on InAs/GaSb type‐II superlattice IR detectors are presented. The activation energy of the dark current density is used to identify the dominating dark current mechanisms (generation–recombination (GR), tunneling, or diffusion dark current) as a function of temperature and bias. The bias evolution of the power spectral density (PSD) is measured in dark conditions for several temperatures. At the operating bias of the detectors, the arrays show a white noise–dominated spectrum up to 100 K with a minor 1/ f contribution (corner frequency around 10 Hz), while for higher temperatures the spectra are 1/ f dominated. The 1/ f noise component is compared to the dominating dark current mechanism in the same temperature and bias regimes. A strong correlation between the 1/ f noise component and the dominating dark current ( I ) is found, with the PSD proportional to I for tunneling currents and I 2 for GR and diffusion currents. Very low noise coefficients of α GR = 4.8 × 10 −9 Hz −1 , α diff = 1.9 × 10 −10 Hz −1 , and α tun = 2.1 × 10 −16 A Hz −1 are observed for these detectors.