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Proceedings Paper

Properties of layered crystals for radiation detectors: TlGaSe[sub]2[/sub] system
Author(s): D. J. Knuteson; N. B. Singh; D. Kahler; B. Wagner; A. Berghmans; S. McLaughlin; K. Schwartz
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Paper Abstract

In this paper we report the thermal and electronic characteristics of the ternary compound TlGaSe2, grown from the melt. The phase-diagram, congruency of material and phase transition were studied by differential thermal analysis. The material melted congruently at 812.9C and did not show any other phases between room temperature and the melting point. Results of crystal growth, and effect of alloying and its effect on crystal growth and properties are also discussed. In high purity material it is easier to cleave the crystal since layers of successive rows of tetrahedrons are turned away from each other by 900. However, by suitable alloying, the angle of the tetrahedrons can be changed and the tendency to cleave can be decreased. This effect will be evaluated by comparing the microstructural properties of pure and alloyed crystals. By measuring the optical transmission band edge we studied details absorption characteristics to evaluate the effect of impurities on recombination characteristics. Results indicated that there were no donor-acceptor recombinations at or above room temperature.

Paper Details

Date Published: 11 September 2009
PDF: 11 pages
Proc. SPIE 7449, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI, 744918 (11 September 2009); doi: 10.1117/12.828472
Show Author Affiliations
D. J. Knuteson, Northrop Grumman Corp. (United States)
N. B. Singh, Northrop Grumman Corp. (United States)
D. Kahler, Northrop Grumman Corp. (United States)
B. Wagner, Northrop Grumman Corp. (United States)
A. Berghmans, Northrop Grumman Corp. (United States)
S. McLaughlin, Northrop Grumman Corp. (United States)
K. Schwartz, Northrop Grumman Corp. (United States)

Published in SPIE Proceedings Vol. 7449:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI
Ralph B. James; Larry A. Franks; Arnold Burger, Editor(s)

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