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Proceedings Paper

Performance of MWIR and SWIR HgCdTe-based focal plane arrays at high operating temperatures
Author(s): Leon Melkonian; James Bangs; Lee Elizondo; Ron Ramey; Ernesto Guerrero
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Paper Abstract

Raytheon Vision Systems (RVS) is producing large format, high definition HgCdTe-based MWIR and SWIR focal plane arrays (FPAs) with pitches of 15 μm and smaller for various applications. Infrared sensors fabricated from HgCdTe have several advantages when compared to those fabricated from other materials -- such as a highly tunable bandgap, high quantum efficiencies, and R0A approaching theoretical limits. It is desirable to operate infrared sensors at elevated operating temperatures in order to increase the cooler life and reduce the required system power. However, the sensitivity of many infrared sensors, including those made from HgCdTe, declines significantly above a certain temperature due to the noise resulting from increasing detector dark current. In this paper we provide performance data on a MWIR and a SWIR focal plane array operating at temperatures up to 160K and 170K, respectively. The FPAs used in the study were grown by molecular beam epitaxy (MBE) on silicon substrates, processed into a 1536x1024 format with a 15 μm pixel pitch, and hybridized to a silicon readout integrated circuit (ROIC) via indium bumps to form a sensor chip assembly (SCA). This data shows that the noise equivalent delta temperature (NEDT) is background limited at f/3.4 in the SWIR SCA (cutoff wavelength of 3.7 μm at 130K) up to 140K and in the MWIR SCA (cutoff wavelength of 4.8 μm at 115K) up to 115K.

Paper Details

Date Published: 3 May 2010
PDF: 11 pages
Proc. SPIE 7660, Infrared Technology and Applications XXXVI, 76602W (3 May 2010); doi: 10.1117/12.850849
Show Author Affiliations
Leon Melkonian, Raytheon Vision Systems (United States)
James Bangs, Raytheon Vision Systems (United States)
Lee Elizondo, Raytheon Vision Systems (United States)
Ron Ramey, Raytheon Vision Systems (United States)
Ernesto Guerrero, Raytheon Vision Systems (United States)

Published in SPIE Proceedings Vol. 7660:
Infrared Technology and Applications XXXVI
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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