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Proceedings Paper

Investigation of non-uniformity and inclusions in 6LiInSe2 utilizing Laser Induced Breakdown Spectroscopy (LIBS)
Author(s): Brenden Wiggins; Eugene Tupitsyn; Pijush Bhattacharya; Emmanuel Rowe; Eric Lukosi; Ondrej Chvala; Arnold Burger; Ashley Stowe
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Paper Abstract

Impurity analysis and compositional distribution studies have been conducted on a crystal of LiInSe2, a compound semiconductor which recently has been shown to respond to ionizing radiation. IR microscopy and laser induced breakdown spectroscopy (LIBS) revealed the presence of inclusions within the crystal lattice. These precipitates were revealed to be alkali and alkaline earth elemental impurities with non-uniform spatial distribution in the crystal. LIBS compositional maps correlate the presence of these impurities with visual color differences in the crystal as well as a significant shift of the band gap. Further, LIBS revealed variation in the ratio of I-III-VI2 elemental constituents throughout the crystal. Analysis of compositional variation and impurities will aid in discerning optimal synthesis and crystal growth parameters to maximize the mobility-lifetime product and charge collection efficiency in the LiInSe2 crystal. Preliminary charge trapping calculations have also been conducted with the Monte Carlo N-particle eXtended (MCNPx) package indicating preferential trapping of holes during irradiation with thermal neutrons.

Paper Details

Date Published: 26 September 2013
PDF: 11 pages
Proc. SPIE 8852, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XV, 88520M (26 September 2013); doi: 10.1117/12.2024125
Show Author Affiliations
Brenden Wiggins, Fisk Univ. (United States)
Eugene Tupitsyn, Fisk Univ. (United States)
Pijush Bhattacharya, Fisk Univ. (United States)
Emmanuel Rowe, Fisk Univ. (United States)
Eric Lukosi, The Univ. of Tennessee (United States)
Ondrej Chvala, The Univ. of Tennessee (United States)
Arnold Burger, Fisk Univ. (United States)
Vanderbilt Univ. (United States)
Ashley Stowe, Fisk Univ. (United States)
Y-12 National Security Complex (United States)

Published in SPIE Proceedings Vol. 8852:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XV
Michael Fiederle; Arnold Burger; Larry Franks; Ralph B. James, Editor(s)

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