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SEDLÁKOVÁ, V., DOBIS, P., ŠIKULA, J., HOSCHL, P., SITA, Z., ZEDNÍČEK, T.
Original Title
Low Frequency Noise of Nb2O5 Thin Insulating Films
Type
conference paper
Language
English
Original Abstract
A low frequency noise and charge carriers transport mechanism analysis have been performed on Nb – Nb2 O5 structures of various thickness to determine the mechanism of current flow and current noise sources. At low applied voltage and room temperature the charge carrier flow give thermally excited electrons hopping from one isolated state to the next. This mechanism yields an ohmic characteristic, exponentially dependent on temperature. At high fields and room temperature the rate limiting steps in the current flow is field-enhanced thermal excitation of trapped electrons into the conduction band. This process is known as Poole-Frenkel effect. In this case the barriers on electrodes determine the current value. Noise spectral density in low frequency range may be considered as superposition of 1/fa noise, burst noise, shot noise and thermal noise. Fluctuation of polarisation and fluctuation of mechanical strain may cause another kind of noise, which may be of importance. Last is the contact resistance noise component, which also makes some structures to be noisy. Two kinds of burst noise can be distinguished: Partial discharges in high electric field and regenerative micro-breaks cause two state RTS like noise, whereas charge transport and polarisation fluctuation bring about a multi-state continuous spectrum noise.
Key words in English
Noise,Fluctuations, Niobium oxide, Thin film
Authors
RIV year
2003
Released
1. 1. 2003
Publisher
CNRL s.r.o.
Location
Czech Republic
ISBN
80-239-1005-1
Book
Proceedings of the 17th International Nonference Noise and Fluctuations ICNF 2003
Pages from
141
Pages to
144
Pages count
4
BibTex
@inproceedings{BUT13188, author="Vlasta {Sedláková} and Pavel {Dobis} and Josef {Šikula} and Pavel {Höschel} and Zdeněk {Sita} and T. {Zedníček}", title="Low Frequency Noise of Nb2O5 Thin Insulating Films", booktitle="Proceedings of the 17th International Nonference Noise and Fluctuations ICNF 2003", year="2003", pages="4", publisher="CNRL s.r.o.", address="Czech Republic", isbn="80-239-1005-1" }