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Proceedings Paper

Two-stack three-color quantum well infrared photodetector for mid- and long-wavelength infrared detection
Author(s): Sheng S. Li; Seung-Hwan Kim; Jun-Hee Moon; Jung Hee Lee; Meimei Z. Tidrow; Walter R. Dyer
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Paper Abstract

In this paper we report a high performance 2-stack, 3-color quantum well infrared photodetector (QWIP) composed of InGaAs/AlGaAs QWIP and an InGaAs/AlGaAs/InGaAs triple- coupled (TC-) QWIP grown on the GaAs substrate for the mid- and long-wavelength (MW/LW) infrared (IR) detection. The basic device structure consists of a MWIR QWIP stack with 3 periods of 43 Angstroms In0.3Ga0.7As quantum well and an undoped 300 Angstroms Al0.3Ga0.7As barrier and a LWIR TC-QWIP stack with 5 periods of 65 Angstroms In0.18Ga0.82As quantum well (QW) and two undoped 60 Angstroms In0.05Ga0.95As Qws separated by 20 Angstroms Al0.08Ga0.92As barriers. The TC-QWIP stack has two response peaks, which are voltage-tunable from 9.2micrometers to 10 micrometers and 12micrometers to 12.2micrometers by the applied bias, respectively. For the LWIR TC-QWIP, a maximum responsivity of 1.96A/W at 12micrometers was obtained at T=40K, and a maximum detectivity of (Formula available in paper) was obtained at Vb=-1.7V, λp=12micrometers , and T=20K. As for the MWIR QWIP stack excellent responsivity at the peak wavelength of λp=5.1micrometers was obtained up to 120 K.

Paper Details

Date Published: 5 August 2002
PDF: 8 pages
Proc. SPIE 4721, Infrared Detectors and Focal Plane Arrays VII, (5 August 2002); doi: 10.1117/12.478848
Show Author Affiliations
Sheng S. Li, Univ. of Florida (United States)
Seung-Hwan Kim, Univ. of Florida (United States)
Jun-Hee Moon, Univ. of Florida (United States)
Jung Hee Lee, Direct2Data Technologies (United States)
Meimei Z. Tidrow, Ballistic Missile Defense Organization (United States)
Walter R. Dyer, Ballistic Missile Defense Organization (United States)


Published in SPIE Proceedings Vol. 4721:
Infrared Detectors and Focal Plane Arrays VII
Eustace L. Dereniak; Robert E. Sampson, Editor(s)

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