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Optical Engineering

Corrugated quantum well infrared photodetectors for far infrared detection
Author(s): Kwong-Kit Choi; Jason Sun; Merzy D. Jhabvala; David P. Forrai; Darrel W. Endres
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Paper Abstract

We have extended our investigation of corrugated quantum well infrared photodetector focal plane arrays (FPAs) into the far infrared regime. Specifically, we are developing the detectors for the thermal infrared sensor (TIRS) used in the Landsat Data Continuity Mission. To maintain a low dark current, we adopted a low doping density of 0.6×1018 cm−3 and a bound-to-bound state detector. The internal absorption quantum efficiency (QE) is calculated to be 25.4%. With a pixel fill factor of 80% and a substrate transmission of 70.9%, the external QE is 14.4%. To yield the theoretical conversion efficiency (CE), the photoconductive gain was measured and is 0.25 at 5 V, from which CE is predicted to be 3.6%. This value is in agreement with the 3.5% from the FPA measurement. Meanwhile, the dark current is measured to be 2.1×10−6 A/cm2 at 43 K. For regular infrared imaging above 8 μm, the FPA will have an noise equivalent temperature difference (NETD) of 16 mK at 2 ms integration time in the presence of 260 read noise electrons. The highest operability of the tested FPAs is 99.967%. With the CE agreement, we project the FPA performance in the far infrared regime up to 30 μm cutoff.

Paper Details

Date Published: 1 June 2011
PDF: 7 pages
Opt. Eng. 50(6) 061005 doi: 10.1117/1.3578406
Published in: Optical Engineering Volume 50, Issue 6
Show Author Affiliations
Kwong-Kit Choi, U.S. Army Research Lab. (United States)
Jason Sun, U.S. Army Research Lab. (United States)
Merzy D. Jhabvala, NASA Goddard Space Flight Ctr. (United States)
David P. Forrai, L-3 Communications Cincinnati Electronics (United States)
Darrel W. Endres, L-3 Communications Cincinnati Electronics (United States)

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