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Proceedings Paper

GaSe and GaTe anisotropic layered semiconductors for radiation detectors
Author(s): Krishna C. Mandal; Michael Choi; Sung Hoon Kang; R. David Rauh; Jiuan Wei; Hui Zhang; Lili Zheng; Y. Cui; M. Groza; A. Burger
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Paper Abstract

High quality detector grade GaSe and GaTe single crystals have been grown by a modified vertical Bridgman technique using high purity Ga (7N) and in-house zone refined (ZR) precursor materials (Se and Te). A state-of-the-art computer model, MASTRAPP, is used to model heat and mass transfer in the Bridgman growth system and to predict the stress distribution in the as-grown crystals. The model accounts for heat transfer in the multiphase system, convection in the melt, and interface dynamics. The crystals harvested from ingots of 8-10 cm length and 2.5 cm diameter, have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, low temperature photoluminescence (PL), atomic force microscopy (AFM), and optical absorption/transmission measurements. Single element devices up to 1 cm2 in area have been fabricated from the crystals and tested as radiation detectors by measuring current-voltage (I-V) characteristics and pulse height spectra using 241Am source. The crystals have shown high promise as nuclear detectors with their high dark resistivity (≥109 Ω.cm), good charge transport properties (μτe ~ 1.4x10-5 cm2/V and μτh ~ 1.5x10-5 cm2/V), and relatively good energy resolution (~4% energy resolution at 60 keV). Details of numerical modeling and simulation, detector fabrication, and testing using a 241Am energy source (60 keV) is presented in this paper.

Paper Details

Date Published: 21 September 2007
PDF: 10 pages
Proc. SPIE 6706, Hard X-Ray and Gamma-Ray Detector Physics IX, 67060E (21 September 2007); doi: 10.1117/12.739399
Show Author Affiliations
Krishna C. Mandal, EIC Labs., Inc. (United States)
Michael Choi, EIC Labs., Inc. (United States)
Sung Hoon Kang, EIC Labs., Inc. (United States)
R. David Rauh, EIC Labs., Inc. (United States)
Jiuan Wei, Stony Brook Univ. (United States)
Hui Zhang, Stony Brook Univ. (United States)
Lili Zheng, Stony Brook Univ. (United States)
Y. Cui, Fisk Univ. (United States)
M. Groza, Fisk Univ. (United States)
A. Burger, Fisk Univ. (United States)

Published in SPIE Proceedings Vol. 6706:
Hard X-Ray and Gamma-Ray Detector Physics IX
Ralph B. James; Arnold Burger; Larry A. Franks, Editor(s)

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