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Proceedings Paper

Mechanisms contributing to dark current across metal/CdMnTe/metal structures
Author(s): V. Sklyarchuk; P. Fochuk; S. Solodin; Z. Zakharuk; A. Rarenko; A. E. Bolotnikov; R. B. James
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Paper Abstract

The study of the electro-physical properties of n-type semi-insulating crystals of indium-doped Cd(Mn)Te solid solution with a resistivity ~ (4÷5)×1010 Ohm×cm at T = 300 K was carried out. The structures both with an ohmic (In/Cd(Mn)Te/In) contacts and with the rectifying (Ni/Cd(Mn)Te/In) contact were fabricated. It was found that for the Ni/Cd(Mn)Te/In structure, the main mechanisms of charge transport were: the generation currents in the space-charge region, space-charge limited currents (SCLC) at high voltages, and the Ohm’s law was valid only on initial section the of the volt-ampere characteristics (I-VC). Calculation of the generation current dependence on the voltage according to the theory of Sah-Noyce-Shockley was carried out. For the In/Cd(Mn)Te/In structure it was observed the I-VC initial section, where the Ohm’s law was implemented, and the SCLCs with the participation of deep centers (traps) in semiinsulating crystal - at greater voltages. The concentration of deep centers (Nt ~ 7.4×1010 cm-3 ) responsible for the trap mechanism in SCLC In/Cd(Mn)Te/In structures was calculated. The energy position Et of the deep levels was determined (provided that the energy was calculated from the valence band edge, Et = 0.89÷0.9 eV). It was discussed and grounded the assumption that SCLC was the main mechanism limiting the operating voltages and, consequently, the use of Cd(Mn)Te-based ionizing-radiation detectors with ohmic contacts.

Paper Details

Date Published: 9 September 2019
PDF: 7 pages
Proc. SPIE 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, 111141V (9 September 2019); doi: 10.1117/12.2530444
Show Author Affiliations
V. Sklyarchuk, Yuriy Fedkovych Chernivtsi National Univ. (Ukraine)
P. Fochuk, Yuriy Fedkovych Chernivtsi National Univ. (Ukraine)
S. Solodin, Yuriy Fedkovych Chernivtsi National Univ. (Ukraine)
Z. Zakharuk, Yuriy Fedkovych Chernivtsi National Univ. (Ukraine)
A. Rarenko, Yuriy Fedkovych Chernivtsi National Univ. (Ukraine)
A. E. Bolotnikov, Brookhaven National Lab. (United States)
R. B. James, Brookhaven National Lab. (United States)
Savannah River National Lab. (United States)

Published in SPIE Proceedings Vol. 11114:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI
Ralph B. James; Arnold Burger; Stephen A. Payne, Editor(s)

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