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Proceedings Paper

Investigation of thermally evaporated high resistive B-doped amorphous selenium alloy films and metal contact studies
Author(s): Cihan Oner; Khai V. Nguyen; Rahmi O. Pak; Mohammad A. Mannan; Krishna C. Mandal
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Paper Abstract

Amorphous selenium (a-Se) alloy materials with arsenic, chlorine, boron, and lithium doping were synthesized for room temperature nuclear radiation detector applications using an optimized alloy composition for enhanced charge transport properties. A multi-step synthetic process has been implemented to first synthesize Se-As and Se-Cl master alloys from zone-refined Se (~ 7N), and then synthesized the final alloys for thermally evaporated large-area thin-film deposition on oxidized aluminum (Al/Al2O3) and indium tin oxide (ITO) coated glass substrates. Material purity, morphology, and compositional characteristics of the alloy materials and films were examined using glow discharge mass spectroscopy (GDMS), inductively coupled plasma mass spectroscopy (ICP-MS), differential scanning calorimetry (DSC), x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive analysis by x-rays (EDAX). Current-Voltage (I-V) measurements were carried out to confirm very high resistivity of the alloy thin-films. We have further investigated the junction properties of the alloy films with a wide variety of metals with different work functions (Au, Ni, W, Pd, Cu, Mo, In, and Sn). The aim was to investigate whether the choice of metal can improve the performance of fabricated detectors by minimizing the dark leakage current. For various metal contacts, we have found significant dependencies of metal work functions on current transients by applying voltages from -800 V to +1000 V.

Paper Details

Date Published: 26 August 2015
PDF: 11 pages
Proc. SPIE 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII, 95931I (26 August 2015); doi: 10.1117/12.2196586
Show Author Affiliations
Cihan Oner, Univ. of South Carolina (United States)
Khai V. Nguyen, Univ. of South Carolina (United States)
Rahmi O. Pak, Univ. of South Carolina (United States)
Mohammad A. Mannan, Univ. of South Carolina (United States)
Krishna C. Mandal, Univ. of South Carolina (United States)

Published in SPIE Proceedings Vol. 9593:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII
Larry Franks; Ralph B. James; Michael Fiederle; Arnold Burger, Editor(s)

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