Neutron transmutation doped natural and isotopically engineered germanium thermistors

Eugene E. Haller; K. M. Itoh; Jeffrey W. Beeman; William L. Hansen; V. I. Ozhogin

doi:10.1117/12.176771

1 June 1994 Neutron transmutation doped natural and isotopically engineered germanium thermistors

Eugene E. Haller, K. M. Itoh, Jeffrey W. Beeman, William L. Hansen, V. I. Ozhogin

Proceedings Volume 2198, Instrumentation in Astronomy VIII; (1994) https://doi.org/10.1117/12.176771
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

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 (N_A,N_D) 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 N_A and N_D 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.

Citation Download Citation

Eugene E. Haller, K. M. Itoh, Jeffrey W. Beeman, William L. Hansen, and V. I. Ozhogin "Neutron transmutation doped natural and isotopically engineered germanium thermistors", Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); https://doi.org/10.1117/12.176771

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