Electrical conductivity and current-voltage characteristics of alumina with or without neutron and electron irradiation

Electron irradiation of high voltage Ni/4H-SiC Schottky diodes with the dose Φ=(0.2-7)×1016cm-2 led to increase in the base resistance, appearance of slow relaxation processes at extremely small currents, and increase of the low frequency noise. On exponential part of the current-voltage characteristics and on linear part of current-voltage characteristics in non-irradiated samples, low frequency noise always has the form of the 1/f noise. On linear part of the current-voltage characteristics in irradiated diodes the generation recombination (GR) noise predominates. Temperature dependences of the base resistivity and character of GR noise indicate that mainly Z1/2 center contributes to the change in the parameters of irradiated samples. Capture cross section of this level, obtained from noise measurements, is within the range (8×10-16-2×10-15) cm2 and only weakly depends on temperature.

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Comparison of Current-Voltage Characteristics of Bulk Polyaniline and Nano Dimensional Polyaniline Particles in Nanoporous Dielectric Matrix of MIL-101

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.711.8 ◽

2013 ◽

Vol 711 ◽

pp. 8-13

Author(s):

A.I. Romanenko ◽

K.M. Limaev ◽

D.N. Dybtsev ◽

V.P. Fedin ◽

S.B. Aliev ◽

...

Keyword(s):

Electrical Conductivity ◽

Temperature Dependence ◽

Model Fit ◽

Tunneling Model ◽

Dielectric Matrix ◽

Current Voltage ◽

Current Voltage Characteristics

We investigated current-voltage (I-V) characteristics of bulk polyaniline and aniline polymerized inside nanopores of chromium terephthalate dielectric matrix MIL-101. The temperature dependence of electrical conductivity σ (T) of these materials are described by the fluctuation-induced tunneling model (FIT), which means that the main contribution to a net conductivity is caused by contacts between particles of the polyaniline. The comparison of I-V for these two types of materials shown that I-V characteristics of bulk polyaniline are described by the quasi-1D VRH model while for aniline polymerized inside nanopores of chromium terephthalate dielectric matrix MIL-101 by extended FIT model.

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Electrical Properties of Graphene Oxide Layers Prepared by Material Inkjet Printing

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.674.109 ◽

2016 ◽

Vol 674 ◽

pp. 109-114 ◽

Cited By ~ 1

Author(s):

Jan Pospisil ◽

Veronika Schmiedova ◽

Oldrich Zmeskal ◽

Viliam Vretenar ◽

Peter Kotrusz

Keyword(s):

Electrical Conductivity ◽

Graphene Oxide ◽

Electrical Properties ◽

Inkjet Printing ◽

Room Temperature ◽

Electronic Devices ◽

Dielectric Measurements ◽

Current Voltage ◽

Bulk Electrical Conductivity ◽

Current Voltage Characteristics

The paper deals with the study of optical and electrical properties of inkjet-printed graphene oxide (GO) layers, which can be used e.g. for the preparation of various types of electronic devices. To ensure stable inkjet printing conditions of GO solution, mixture was thoroughly stirred for 1 h at room temperature or sonicated in the bath for 30 min. The thicknesses of prepared layers were determined by spectroscopic ellipsometry and profilometry. An electrical conductivity of GO was increased by the multistep reduction (due to annealing) – the conductivity was changed by these processes about seven orders of magnitude (GO is an isolator and reduced GO is a conductor). For electrical and dielectric measurements, samples with GO and mixture of GO with PEDOT were prepared. All current-voltage characteristics have a diode character. From AC measurements the bulk electrical conductivity and geometric capacity of prepared layers were determined.

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Electrical conductivity of lithium tantalate thin film

Cerâmica ◽

10.1590/0366-69132020663792885 ◽

2020 ◽

Vol 66 (379) ◽

pp. 291-296

Author(s):

S. I. Gudkov ◽

A. V. Solnyshkin ◽

D. A. Kiselev ◽

A. N. Belov

Keyword(s):

Thin Film ◽

Electrical Conductivity ◽

Space Charge ◽

Rf Magnetron Sputtering ◽

Lithium Tantalate ◽

Film Structure ◽

Charge Carriers ◽

Transport Mechanisms ◽

Current Voltage ◽

Current Voltage Characteristics

Abstract The electrical conductivity of lithium tantalate thin film on the silicon substrate was studied. The film structure was prepared by RF magnetron sputtering. In general, the current-voltage characteristics were asymmetric and similar to that of a diode. The current-voltage characteristics had several sections associated with various transport mechanisms of current carriers. The main conductivity mechanism was related to the space-charge-limited current. The current-voltage characteristics showed that there was a mismatch between the forward and backward runs. One of the reasons for such behavior is a space charge accumulation due to charge carriers which were injected from the electrode and did not relax.

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SYNTHESIS, MECHANICAL AND ELECTRICAL PROPERTIES OF CARBON MICROCOILS AND NANOCOILS

Functional Materials Letters ◽

10.1142/s179360471000138x ◽

2010 ◽

Vol 03 (04) ◽

pp. 263-267 ◽

Cited By ~ 3

Author(s):

HUI BI ◽

KAICHANG KOU ◽

YONGBAI YIN ◽

KOSTYA (KEN) OSTRIKOV ◽

ZONGWEN LIU

Keyword(s):

Electrical Conductivity ◽

Electrical Properties ◽

Cross Section ◽

Electrical Resistance ◽

Emission Intensity ◽

Sem Analysis ◽

Mechanical And Electrical Properties ◽

Current Voltage ◽

Current Voltage Characteristics ◽

Test Voltage

The results on the synthesis, mechanical and electrical properties of carbon microcoils and nanocoils (CMCs, CNCs) synthesized using catalytic CVD and Ni–P and Co–P catalyst alloys, respectively, are reported. SEM analysis reveals that the CMCs and CNCs have unique helical morphologies, and diameters of 5.0–9.0 μm and 450–550 nm, respectively. Moreover, CMCs with flat cross-section can be stretched to 3 times their original coil lengths. Current–voltage characteristics of a single microcoil have also been obtained. It is found that the CMCs have the electrical conductivity between 100 and 160 S/cm, whereas the electrical resistance increases by about 20% during the coil extension. Besides, the microcoils can produce light in vacuum when the test voltage reaches 10 V. The emission intensity increases as the voltage increases. The mechanical and electrical properties of CMCs and CNC make them potentially useful in many applications in micromagnetic sensors, mechanical microsprings and optoelectronics.

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