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Proceedings Paper

Uncooled photovoltaic Hg1-xCdxTe LWIR detectors
Author(s): Jozef Piotrowski; Miroslaw Grudzien; Zenon Nowak; Zbigniew Orman; Jaroslaw Pawluczyk; Mariusz Romanis; Waldemar Gawron
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Paper Abstract

We report an advanced Hg1-xCdxTe photovoltaic detector based on monolithic Hg1-xCdxTe heterostructure with 3-dimensional architecture. It consists of a narrow gap, p-type Hg1-xCdxTe small size (approximately equals 10x10x7 micrometers ) absorber of infrared radiation buried in a graded gap Hg1-xCdxTe layer surrounding absorber and heterojunction contacts obtained by selective doping of the graded gap Hg1-xCdxTe layer surrounding the absorber region. The heterostructure is passivated with a ZnS layer and coated with contact metallization to nPLU and p-type regions. The device is supplied with 50x50 micrometers immersion microlens formed directly in the CdZnTe substrate. These two layers also play a role of a mirror that improves quantum efficiency for weakly absorbed infrared radiation. In addition, the mirror eliminates backside incidence of thermal radiation, which prevents generation of dark current. The design of the device is optimized to achieve the best compromise between requirements of good absorption and collection efficiency; low thermal generation; and low parasitic impedance. Test devices have been prepared using the modified isothermal vapor phase epitaxy of Hg1-xCdxTe on profiled CdZnTe substrates, negative epitaxy of Hg1-xCdxTe to widen band gap of surface regions, selective doping, multiple chemical etching and ion milling, vacuum deposition of dielectric and metal layers.

Paper Details

Date Published: 15 December 2000
PDF: 10 pages
Proc. SPIE 4130, Infrared Technology and Applications XXVI, (15 December 2000); doi: 10.1117/12.409841
Show Author Affiliations
Jozef Piotrowski, Vigo Systems Ltd. (Poland)
Miroslaw Grudzien, Vigo Systems Ltd. (Poland)
Zenon Nowak, Vigo Systems Ltd. (Poland)
Zbigniew Orman, Vigo Systems Ltd. (Poland)
Jaroslaw Pawluczyk, Vigo Systems Ltd. (Poland)
Mariusz Romanis, Vigo Systems Ltd. (Poland)
Waldemar Gawron, Military Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 4130:
Infrared Technology and Applications XXVI
Bjorn F. Andresen; Gabor F. Fulop; Marija Strojnik, Editor(s)

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