Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2011-08-25
Physics
Condensed Matter
Other Condensed Matter
21 pages, 10 figures
Scientific paper
In this paper, a four-point characterization method is developed for resistive samples connected to either resistive or capacitive contacts. Provided the circuit equivalent of the complete measurement system is known including coaxial cable and connector capacitances as well as source output and amplifier input impedances, a frequency range and capacitive scaling factor can be determined, whereby four-point characterization can be performed. The technique is demonstrated with a discrete element test sample over a wide frequency range using lock-in measurement techniques from 1 Hz - 100 kHz. The data fit well with a circuit simulation of the entire measurement system. A high impedance preamplifier input stage gives best results, since lock-in input impedances may differ from manufacturer specifications. The analysis presented here establishes the utility of capacitive contacts for four-point characterizations at low frequency.
Grayson Matt
Işık N.
Kim Brian S.
Shah Yash D.
Zhou Chuanle
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