Field-induced anomalous changes in Cr/a-SI:H/V thin film structures.

Hu, J, Snell, A J, Hajto, Janos, Rose, M J and Edmiston, W (2001) Field-induced anomalous changes in Cr/a-SI:H/V thin film structures. Thin Solid Films, 396 (1-2). pp. 240-249. ISSN 0040 6090

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Experimental results on the electronic properties of conditioned Cr/hydrogenated amorphous silicon (a-Si:H)/V thin film devices are presented. The devices under test were electro-formed, and had resistances in the range from several hundred Ohms to several kiloOhms. The current of conditioned devices varied non-linearly with bias at low voltages, but exhibited jumps' at a threshold voltage (Vth) (typically 2-3 V), leading to a resistance change of one to three orders of magnitude. Above Vth the current increased almost linearly with bias, and the carrier transport changed from a semiconducting behaviour to a more conducting (metallic) state. This was confirmed by a.c. characteristics of the conditioned devices, which showed a transition from a capacitive to an inductive behaviour around Vth. The threshold voltage Vth, was found to decrease with increasing temperature and disappeared at 340-350 K, but recovered when the temperature was reduced. The transition at Vth has been analysed in terms of an electrothermal mechanism. The calculated turnover temperature is approximately 346 K, close to that for the disappearance of Vth We suggest that the observed transition could involve vanadium oxides such as VO2. The phase transition could also facilitate the underlying quantisation effect.

Item Type: Article
Print ISSN: 0040 6090
Electronic ISSN: 1879-2731
Uncontrolled Keywords: Transition elements ; Experimental study ; Silicon ; Chromium ; Vanadium ; Thin films ; Amorphous hydrogenated material ; Solid-solid interfaces ; Quantization ; Semiconductor metal transition ; Electric field effects ; IV characteristic ; Anomaly ; Electrical conductivity
University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
Dewey Decimal Subjects: 500 Science > 530 Physics
Library of Congress Subjects: Q Science > QC Physics
Item ID: 1949
Depositing User: RAE Import
Date Deposited: 13 Jun 2008 10:34
Last Modified: 26 Aug 2013 15:42

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