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Proceedings Paper

Multi-color IRFPAs made from HgCdTe grown by MOVPE
Author(s): C. L. Jones; L. G. Hipwood; J. Price; C. J. Shaw; P. Abbott; C. D. Maxey; H. W. Lau; R. A. Catchpole; M. Ordish; P. Knowles; N. T. Gordon
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Paper Abstract

The drive towards improved target recognition has led to an increasing interest in detection in more than one infrared band. This paper describes the design, fabrication and performance of two-colour and three-colour infrared detectors made from HgCdTe grown by Metal Organic Vapour Phase Epitaxy (MOVPE). The detectors are staring, focal plane arrays consisting of HgCdTe mesa-diode arrays bump bonded to silicon read-out integrated circuits (ROICs). Each mesa diode has one connection to the ROIC and the colours are selected by varying the applied bias. Results will be presented for both two-colour and three-colour devices. In a two-colour n-p-n design the cut-off wavelengths are defined by the compositions of the two n-type absorbers and the doping and composition of the p-type layer are chosen to prevent transistor action. The bias polarity is used to switch the output between colours. This design has been used to make MW/LW detectors with a MW band covering 3 to 5 μm and a LW band covering 5 to 10 μm. In a three-colour n-p-n design the cut-off wavelengths are defined by the compositions of the two n-type absorbers and the p-type absorber, which has an intermediate cut-off wavelength. The absorbers are separated from each other by electronic barriers consisting of wide band-gap material. At low applied bias these barriers prevent photo-electrons generated in the p-type absorber from escaping and the device then gives an output from one of the n-type absorbers. At high applied bias the electronic barrier is pulled down and the device gives an output from both the p-type absorber and one of the n-type absorbers. Thus by varying the polarity and magnitude of the bias it is possible to obtain three-colours from a two-terminal device. This design has been used to make a SW/MW/MW detector with cut-off wavelengths of approximately 3, 4 and 6 μm.

Paper Details

Date Published: 14 May 2007
PDF: 8 pages
Proc. SPIE 6542, Infrared Technology and Applications XXXIII, 654210 (14 May 2007); doi: 10.1117/12.720645
Show Author Affiliations
C. L. Jones, SELEX Sensors and Airborne Systems Ltd. (United Kingdom)
L. G. Hipwood, SELEX Sensors and Airborne Systems Ltd. (United Kingdom)
J. Price, SELEX Sensors and Airborne Systems Ltd. (United Kingdom)
C. J. Shaw, SELEX Sensors and Airborne Systems Ltd. (United Kingdom)
P. Abbott, SELEX Sensors and Airborne Systems Ltd. (United Kingdom)
C. D. Maxey, SELEX Sensors and Airborne Systems Ltd. (United Kingdom)
H. W. Lau, SELEX Sensors and Airborne Systems Ltd. (United Kingdom)
R. A. Catchpole, SELEX Sensors and Airborne Systems Ltd. (United Kingdom)
M. Ordish, SELEX Sensors and Airborne Systems Ltd. (United Kingdom)
P. Knowles, SELEX Sensors and Airborne Systems Ltd. (United Kingdom)
N. T. Gordon, QinetiQ Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 6542:
Infrared Technology and Applications XXXIII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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