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ŠIK, O. GRMELA, L. ELHADIDY, H. DĚDIČ, V. ŠIKULA, J. GRMELA, P. FRANC, J. ŠKARVADA, P. HOLCMAN, V.
Originální název
Study of Electric Field Distribution and Low Frequency Noise of CdZnTe Radiation Detectors
Typ
článek v časopise - ostatní, Jost
Jazyk
angličtina
Originální abstrakt
Polarization phenomena in a metal-semiconductor-metal (M-S-M) structure of metallic Schottky contacts deposited on CdZnTe radiation detectors were studied. We evaluate the distribution of the electric field along the biased M-S-M structure by Pockels measurements. The results show that almost all the electric field is developed across the depletion layer of the reverse-biased contact. The noise measurements of the CdZnTe detectors studied show that the dominant noise is 1/f m noise. The 1/f m noise, with parameter m close to unity, is present at frequencies bellow 100 Hz and its bandwidth decreases in the course of the polarization process. At higher frequencies, we observed an increase of the m parameter to 2, which indicates a strengthened effect of generation-recombination processes. In the frequency band of dominating 1/f m = 1 noise, the increase of magnitude of noise spectral density was proportional to the power of 6, in relation to current through the detector. This high value is explained as a result of a screening effect of the space charge buildup during the polarization
Klíčová slova
Gamma detectors, CdTe. Polarization, Pockels Effect, Noise
Autoři
ŠIK, O.; GRMELA, L.; ELHADIDY, H.; DĚDIČ, V.; ŠIKULA, J.; GRMELA, P.; FRANC, J.; ŠKARVADA, P.; HOLCMAN, V.
Rok RIV
2013
Vydáno
6. 6. 2013
Nakladatel
IOP
Místo
London, Great Britain
ISSN
1748-0221
Periodikum
Journal of Instrumentation
Ročník
6
Číslo
23
Stát
Spojené království Velké Británie a Severního Irska
Strany od
1
Strany do
Strany počet
URL
http://iopscience.iop.org/1748-0221/8/06/C06005
BibTex
@article{BUT99274, author="Ondřej {Šik} and Lubomír {Grmela} and Hassan {Elhadidy} and Václav {Dědič} and Josef {Šikula} and Petr {Grmela} and Jan {Franc} and Pavel {Škarvada} and Vladimír {Holcman}", title="Study of Electric Field Distribution and Low Frequency Noise of CdZnTe Radiation Detectors", journal="Journal of Instrumentation", year="2013", volume="6", number="23", pages="1--6", doi="10.1088/1748-0221/8/06/C06005", issn="1748-0221", url="http://iopscience.iop.org/1748-0221/8/06/C06005" }