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Proceedings Paper

Neutron transmutation doped natural and isotopically engineered germanium thermistors
Author(s): Eugene E. Haller; K. M. Itoh; Jeffrey W. Beeman; William L. Hansen; V. I. Ozhogin
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Paper Abstract

We report on the development, fabrication and performance of a new class of thermal sensors for far IR and millimeter wave detection. These devices consist of small single crystal samples of ultra-pure, natural or isotopically engineered germanium which have been doped by the neutron transmutation doping (NTD) technique. The concentrations of the acceptor and donor dopants (NA,ND) can be accurately controlled with this technique. They depend on the thermal neutron fluence, the neutron absorption cross sections and the atomic fractions of 70Ge (for the Ga acceptors) and 74Ge (for the As donors), respectively. The values of NA and ND and their ratio result in a predictable resistivity of the Ge crystals down to temperatures of a few milliKelvin. The excellent control of the resistivity down to very low temperatrues, together with the development of ohmic contacts working at the lowest temperatures, allows the fabrication of high sensitivity bolometer arrays with over 100 pixels and highly uniform response.

Paper Details

Date Published: 1 June 1994
PDF: 8 pages
Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); doi: 10.1117/12.176771
Show Author Affiliations
Eugene E. Haller, Lawrence Berkeley Lab. and Univ. of California/Berkeley (United States)
K. M. Itoh, Lawrence Berkeley Lab. and Univ. of California/Berkeley (United States)
Jeffrey W. Beeman, Lawrence Berkeley Lab. (United States)
William L. Hansen, Lawrence Berkeley Lab. (United States)
V. I. Ozhogin, I.V. Kurchatov Institute of Atomic Energy (Russia)

Published in SPIE Proceedings Vol. 2198:
Instrumentation in Astronomy VIII
David L. Crawford; Eric R. Craine, Editor(s)

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