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Title: Electronic characterization of mercuric iodide gamma ray spectrometers

During the past four years the yield of high resolution mercuric iodide (HgI[sub 2]) gamma ray spectrometers produced at EG G/EM has increased dramatically. Data is presented which demonstrates a strong correlation between starting material and spectrometer performance. Improved spectrometer yields are attributed to the method of HgI[sub 2] synthesis and to material purification procedures. Data is presented which shows that spectrometer performance is correlated with hole mobility-lifetime products. In addition, the measurement of Schottky barrier heights on HgI[sub 2] spectrometers has been performed using I-V curves and the photoelectric method. Barrier heights near 1.1 eV have been obtained using various contacts and contact deposition methods. These data suggest the pinning of the Fermi level at midgap at the HgI[sub 2] surface, probably due to surface states formed prior to contact deposition.
Authors:
Publication Date:
OSTI Identifier:
6337510
Report Number(s):
EGG-10617-2182; CONF-930405--22
ON: DE93015524
DOE Contract Number:
AC08-88NV10617
Resource Type:
Conference
Resource Relation:
Conference: Spring meeting of the Materials Research Society, San Francisco, CA (United States), 12-16 Apr 1993
Research Org:
EG and G Energy Measurements, Inc., Goleta, CA (United States). Santa Barbara Operations
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; GAMMA SPECTROMETERS; ELECTRICAL PROPERTIES; PERFORMANCE; MERCURY IODIDES; PURIFICATION; SYNTHESIS; DATA; DEPOSITION; FERMI LEVEL; GAMMA RADIATION; HOLE MOBILITY; LIFETIME; RESOLUTION; ELECTROMAGNETIC RADIATION; ENERGY LEVELS; HALIDES; HALOGEN COMPOUNDS; INFORMATION; IODIDES; IODINE COMPOUNDS; IONIZING RADIATIONS; MEASURING INSTRUMENTS; MERCURY COMPOUNDS; MERCURY HALIDES; MOBILITY; PHYSICAL PROPERTIES; RADIATIONS; SPECTROMETERS 440103* -- Radiation Instrumentation-- Nuclear Spectroscopic Instrumentation