DC conductivity measurements in the Van der Pauw geometry

Rietveld, G.; Koijmans, Ch.V.; Henderson, L C A; Hall, Michael J.; Harmon, Stuart; Warnecke, P.; Schumacher, B.

doi:10.1109/cpem.2002.1034896

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…Then, values were obtained by multiplying Rsh to the film thickness value which was determined as d = 106±2 nm. The degree of uncertainty is difficult to quantify, but the deviation was considered mainly due to systematic errors resulting from probes surface area and their non-ohmic contacts, which affects the relative behavior of different films in a similar way [37]. The optical transmittance T and reflectance R spectra of Group B samples after the additional heat-treatment are compared in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Sol-Gel Route to Obtain a Highly Transparent and Conductive Aluminum-doped Zinc Oxide Thin Film

Nateq¹,

Ceccato²

2019

Preprint

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The electrical and optical properties of sol-gel derived aluminum-doped0 zinc oxide thin films containing 2 at.% Al were investigated considering the modifying effects of 1) increasing the sol H2O content; and 2) thermal treatment procedure with high-temperature approach followed by an additional heat-treatment step under a reducing atmosphere. According to the results obtained via the TG-DTA analysis, FT-IR spectroscopy, X-ray diffraction technique and four-point probe resistivity measurement, it is argued that the sol hydrolysis, decomposition of the deposited gel and crystallization of grains result in grains of larger crystallite size and stronger c-axis preferred orientation with slightly less microstrain in the modified sample. The consequent morphology and grain-boundary characteristics turn out as improved conductivity, implying higher values of concentration and mobility of charge carriers. A detailed investigation on samples optical properties, in terms of analyzing their absorption and dispersion behaviors through the UV-Vis-NIR spectroscopy, support our reasoning for the increase of the mobility, and to a lesser extent, the concentration of charge carriers, while causing only a slight degradation of optical transmission. Hence, an enhanced performance as a transparent conducting film is claimed for the modified sample by comparing the figure-of-merit values.

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Section: Resultsmentioning

confidence: 99%

Enhanced Sol-Gel Route to Obtain a Highly Transparent and Conductive Aluminum-doped Zinc Oxide Thin Film

Nateq¹,

Ceccato²

2019

Preprint

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“…The function 1 Q to be integrated has a dominant peak as shown in Figure 1. The width of the peak exhibits inverse dependence on the outer diameter of the coil.…”

Section: Forward Problem Solutionmentioning

confidence: 99%

“…Several calibration techniques based on DC current [1], AC current [2] and combination of both methods [3] have been developed.…”

Section: Introductionmentioning

confidence: 99%

Grid-based computational algorithm for accurate AC conductivity measurements

Pokatilov

Parker

Kübarsepp

et al. 2013

16th International Congress of Metrology

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Abstract.A novel computational method is proposed for the accurate determination of the electrical conductivity of non-ferrous metal samples in the wide frequency range. The forward and inverse problems solution have been proposed allowing computation of the AC conductivity value from the electrical impedance change measurements of a thoroughly characterised inductive sensor. The developed method is applicable in the accurate electrical conductivity measurements at frequencies up to 500 kHz with the measurement uncertainty less than 1 % of the measured value.

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“…The van der Pauw (VdP) structure, based upon the theoretical work of van der Pauw (Pauw, 1958), is a test structure widely used for measuring resistivity of arbitrary shaped samples of constant thickness. Over the years, many researchers have extended the original ideas to develop a variety of approaches for evaluating the resistivities of both isotropic an anisoptropic materials using the VdP type structures (Futamata, 1992;Ramadan, 1994;Gelder, 1995;Rietveld, 2003).…”

Section: Introductionmentioning

confidence: 99%

The Extension of the Van Der Pauw Method to Anisotropic Media

2007

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The method for calculating the specific conductivity tensor of an anisotropically conductive medium, proposed in this paper, distinguishes itself by the simplicity of physical measurements: it suffices to make an equally thick rectangle-shaped sample with four electrodes fixed on its sides and to take various measurements of current intensity and differences of potentials. The necessary mathematical calculations can be promptly performed, even without using a complex computing technique. The accuracy of the results obtained depends on the dimensions of the sample and on the ratios of the conductivity tensor components.

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DC conductivity measurements in the Van der Pauw geometry

Cited by 5 publications

References 3 publications

Enhanced Sol-Gel Route to Obtain a Highly Transparent and Conductive Aluminum-doped Zinc Oxide Thin Film

Enhanced Sol-Gel Route to Obtain a Highly Transparent and Conductive Aluminum-doped Zinc Oxide Thin Film

Grid-based computational algorithm for accurate AC conductivity measurements

The Extension of the Van Der Pauw Method to Anisotropic Media

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