Photocurrent-Induced 1/f Noise in A^IIIB^V T2SLs Infrared Detectors

This letter focuses on the 1/f noise induced by a photocurrent in infrared (IR) detectors based on the AIIIBV InAs/GaSb, and InAs/InAsSb type-II superlattices (T2SLs) optimized for mid-, or long-wavelength range. The relative photocurrent 1/f noise <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\alpha _{\textit {ph}}\approx {3}\times {10}^{-{11}}$ </tex-math></inline-formula> and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\alpha _{\textit {ph}}\approx {7}\times {10}^{-{11}}$ </tex-math></inline-formula> were found for detectors based on InAs/GaSb and InAs/InAsSb T2SLs, respectively. It was shown that the dark current generates <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1/{f}$ </tex-math></inline-formula> noise much more efficiently than the photocurrent in all detectors. The lowest relative dark current 1/f noise <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\alpha _{d}\approx {4}\times {10}^{-{8}}$ </tex-math></inline-formula> was obtained for interband cascade InAs/InAsSb T2SL detectors. The correlation between the photocurrent and the dark current 1/f noises was extracted, suggesting that both components partially origin the same source.