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Open-Source Automated Mapping Four-Point Probe
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== Theory == The system used in-line four point probe method which works as depicted in the following figure: [[File:Fourpointprobe.png|300px]] Four needle with equal spacing is placed on the sample to be measured, and a current source is connected to the outer pair of needles. Then the voltage generated between the inner pair of needles is measured. Then the sheet resistance is measured with the formula: Sheet Resistance = Constant * (Voltage measured / Current value) Where the constant is 4.532 if the following conditions are true: * The diameter of the sample is large compared to distance between the needles. * The thickness of the sample is small compared to distance between the needles. * The location of the needles is not too close to the edge of the sample. If these conditions are not met, please follow the references in the paper to calculate the correction factor required.
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