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Proceedings Paper

Far-infrared Ge:Ga detector for low-background space-based astronomical observations
Author(s): Michael A. Patrashin; Mikio Fujiwara; Norihisa Hiromoto; Boris I. Fouks
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Paper Abstract

A concept of a sensitive cryogenically cooled far IR detector is presented. The device consists of a photosensitive Ge:GA element with one blocking and one injecting contact. Operation of the structure as a photodetector involves two steps. The measurements of the signal occurs when the reverse polarity of the bias voltage applied to the device and the registered photocurrent is proportional to the photon influx. Since the blocking contact does not supply majority carriers into the device, the photocurrent consists only of the carriers generated by IR photons from the acceptor impurities. When the space charge accumulated on the acceptors reaches the value sufficient for significant variation of the electric field in the bulk the device is reset by applying the forward polarity of the bias, which restores the initial charge state of the impurities. Device model and experimental data illustrating properties of the structure at moderately low photon fluxes are also discussed.

Paper Details

Date Published: 21 August 1998
PDF: 8 pages
Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); doi: 10.1117/12.317303
Show Author Affiliations
Michael A. Patrashin, Communications Research Lab. (Japan)
Mikio Fujiwara, Communications Research Lab. (Japan)
Norihisa Hiromoto, Communications Research Lab. (Japan)
Boris I. Fouks, Institute of Radioengineering and Electronics (Russia)


Published in SPIE Proceedings Vol. 3354:
Infrared Astronomical Instrumentation
Albert M. Fowler, Editor(s)

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