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Proceedings Paper

Fabrication of high-operating temperature (HOT), visible to MWIR, nCBn photon-trap detector arrays
Author(s): Hasan Sharifi; Mark Roebuck; Terry De Lyon; Hung Nguyen; Margaret Cline; David Chang; Daniel Yap; Sarabjit Mehta; Rajesh Rajavel; Adrian Ionescu; Arvind D'Souza; Ernest Robinson; Daniel Okerlund; Nibir Dhar
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Paper Abstract

We describe our recent efforts in developing visible to mid-wave (0.5 µm to 5.0 µm) broadband photon-trap InAsSb-based infrared detectors grown on GaAs substrates operating at high temperature (150-200K) with low dark current and high quantum efficiency. Utilizing an InAsSb absorber on GaAs substrates instead of an HgCdTe absorber will enable low-cost fabrication of large-format, high operating temperature focal plane arrays. We have utilized a novel detector design based-on pyramidal photon trapping InAsSb structures in conjunction with compound barrier-based device architecture to suppress both G-R dark current, as well as diffusion current through absorber volume reduction. Our optical simulation show that our engineered pyramid structures minimize the surface reflection compared to conventional diode structures acting as a broadband anti-reflective coating (AR). In addition, it exhibits > 70-80% absorption over the entire 0.5 µm to 5.0 µm spectral range while providing up to 3× reduction in absorber volume. Lattice-mismatched InAs0.82Sb0.18 with 5.25 µm cutoff at 200K was grown on GaAs substrates. 128×128/60μm and 1024×1024/18μm detector arrays that consist of bulk absorber as well as photon-trap pyramid structures were fabricated to compare the detector performance. The measured dark current density for the diodes with the pyramidal absorber was 3× lower that for the conventional diode with the bulk absorber, which is consistent with the volume reduction due to the creation of the pyramidal absorber topology. We have achieved high D* (< 1.0 x 1010 cm √Hz/W) and maintain very high (< 80 %) internal quantum efficiency over the entire band 0.5 to 5 µm spectral band at 200K.

Paper Details

Date Published: 18 June 2013
PDF: 6 pages
Proc. SPIE 8704, Infrared Technology and Applications XXXIX, 87041U (18 June 2013); doi: 10.1117/12.2015083
Show Author Affiliations
Hasan Sharifi, HRL Labs., LLC (United States)
Mark Roebuck, HRL Labs., LLC (United States)
Terry De Lyon, HRL Labs., LLC (United States)
Hung Nguyen, HRL Labs., LLC (United States)
Margaret Cline, HRL Labs., LLC (United States)
David Chang, HRL Labs., LLC (United States)
Daniel Yap, HRL Labs., LLC (United States)
Sarabjit Mehta, HRL Labs., LLC (United States)
Rajesh Rajavel, HRL Labs., LLC (United States)
Adrian Ionescu, DRS Sensors & Targeting Systems, Inc. (United States)
Arvind D'Souza, DRS Sensors & Targeting Systems, Inc. (United States)
Ernest Robinson, DRS Sensors & Targeting Systems, Inc. (United States)
Daniel Okerlund, DRS Sensors & Targeting Systems, Inc. (United States)
Nibir Dhar, DARPA/MTO (United States)

Published in SPIE Proceedings Vol. 8704:
Infrared Technology and Applications XXXIX
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; Paul R. Norton; Patrick Robert, Editor(s)

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