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Proceedings Paper

Design and development of low dark current SLS detectors for IRFPA applications
Author(s): Eric A. DeCuir; Nutan Gautam; Gregory P. Meissner; Priyalal Wijewarnasuriya; Sanjay Krishna; Nibir K. Dhar; Thomas G. Bramhall; Roger E. Welser; Ashok K. Sood
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Paper Abstract

We present the performance of a unipolar barrier long-wave type-II InAs/GaSb superlattice (SLS) photodetector with a 50% cut-off wavelength of approximately 8.7 microns. In this study, the ability to lower dark current densities over traditional PIN diodes is presented by way of hetero-structure engineering of a pBiBn structure utilizing superlattice Ptype (P) and N-type (N) contacts, Intrinsic (I) superlattice active (absorber) region, and unipolar superlattice electron and hole blocking (b) layers. The spectral response of this pBiBn detector structure was determined using a Fourier Transform Infrared (FTIR) Spectrometer and the quantum efficiency (QE) was determined using a narrow 6250 nm narrow band filter and a 500K blackbody source. A diode structure designed, grown, and fabricated in this study yielded a dark current density of less than one (1) mA/cm2 at a reverse bias of 150 mV and a specific detectivity value of greater than 1011 Jones at 77K. In addition to single point temperature measurements, a variable temperature study (80K-300K) of the dark current is presented for a diode demonstrating diffusion limited dark current from 160K down to 80K.

Paper Details

Date Published: 19 October 2012
PDF: 7 pages
Proc. SPIE 8512, Infrared Sensors, Devices, and Applications II, 85120N (19 October 2012); doi: 10.1117/12.974237
Show Author Affiliations
Eric A. DeCuir, U.S. Army Research Lab. (United States)
Nutan Gautam, Univ. of New Mexico (United States)
Gregory P. Meissner, U.S. Army Research Lab. (United States)
Priyalal Wijewarnasuriya, U.S. Army Research Lab. (United States)
Sanjay Krishna, Univ. of New Mexico (United States)
Nibir K. Dhar, DARPA/MTO (United States)
Thomas G. Bramhall, U.S. Army (United States)
Roger E. Welser, Magnolia Optical Technologies, Inc. (United States)
Ashok K. Sood, Magnolia Optical Technologies, Inc. (United States)

Published in SPIE Proceedings Vol. 8512:
Infrared Sensors, Devices, and Applications II
Paul D. LeVan; Ashok K. Sood; Priyalal S. Wijewarnasuriya; Arvind I. D'Souza, Editor(s)

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