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Threshold wavelength extension with dark current reduction in infrared detectors
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Paper Abstract

The standard threshold wavelength (λt) of an Infrared (IR) detector is related to the energy gap Δ is given by Δ = 1.24/λt . Here, we summarize the results of a new class of IR detectors, that display threshold wavelengths (λt eff) (< λt) for the same corresponding Δ designed for λt . The extended threshold (ET) wavelength detectors includes epi-layers of barrieremitter-barrier, which are sandwiched in between the two contact regions. Spectral response of the device structures with different energy offsets between the barriers shows the wavelength extension, while the standard λt is observed without this offset (δ𝐸). The ET wavelength phenomena coupled with a reduced dark current corresponding to the designed Δ could provide a specific detectivity (D*) advantage over conventional detectors. A possible explanation of the results which include the role of potential barrier gradient for the performance of detectors will also be discussed.

Paper Details

Date Published: 9 September 2019
PDF: 7 pages
Proc. SPIE 11128, Infrared Remote Sensing and Instrumentation XXVII, 1112809 (9 September 2019); doi: 10.1117/12.2531639
Show Author Affiliations
A. G. Unil Perera, Georgia State Univ. (United States)
Hemendra Ghimire, Georgia State Univ. (United States)


Published in SPIE Proceedings Vol. 11128:
Infrared Remote Sensing and Instrumentation XXVII
Marija Strojnik; Gabriele E. Arnold, Editor(s)

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