NTD germanium: a novel material for low-temperature bolometers

Conference · Tue Jun 01 04:00:00 EDT 1982

OSTI ID:5224080

Haller, E E; Palaio, N P; Rodder, M; Hansen, W L; Kreysa, E

Six samples of ultra-pure (absolute value N/sub A/ - N/sub D/ absolute value less than or equal to 10/sup 11/cm/sup -3/), single-crystal germanium have been neutron transmutation doped with neutron doses between 7.5 x 10/sup 16/ and 1.88 x 10/sup 18/cm/sup -2/. After thermal annealing at 400/sup 0/C for six hours in a pure argon atmosphere, the samples have been characterized with Hall effect and resistivity measurements between 300 and 0.3 K. Our results show that the resistivity in the low temperature, hopping conduction regime can be approximated with rho = rho/sub 0/exp(..delta../T). The three more heavily doped samples show values for rho/sub 0/ and ..delta.. ranging from 430 to 3.3 ..cap omega.. cm and from 4.9 to 2.8 K, respectively. The excellent reproducibility of neutron transmutation doping and the values of rho/sub 0/ and ..delta.. make NTD Ge a prime candidate for the fabrication of low temperature, low noise bolometers. The large variation in the tabulated values of the thermal neutron cross sections for the different germanium isotopes makes it clear that accurate measurements of these cross-sections for well defined neutron energy spectra would be highly desirable.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5224080
• Report Number(s): LBL-14649; CONF-8206100-1; ON: DE82018580
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANNEALING
BARYON REACTIONS
BOLOMETERS
CRYSTAL DOPING
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
FABRICATION
GERMANIUM
HADRON REACTIONS
HALL EFFECT
HEAT TREATMENTS
MEASURING INSTRUMENTS
METALS
MONOCRYSTALS
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
PHYSICAL PROPERTIES
TEMPERATURE MEASUREMENT
TRANSMUTATION
ULTRALOW TEMPERATURE