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PROJECT TITLE :

Novel Wideband Eddy Current Device for the Conductivity Measurement of Semiconductors

ABSTRACT:

We have a tendency to report on the development and application of a brand-new contactless method based mostly on eddy currents with a view to planning a generic apparatus for the characterization of some transport properties of a big range of semiconductors. The eddy current probe, constituted of a coil connected to a transmission line, interacts with the semiconductor wafer below inspection. The innovative approach of this letter consists in measuring the impedance of the coil by reflectometry using a broadband multicarrier take a look at signal, i.e., containing multiple frequencies. An analytical electromagnetic model of the coil-wafer interaction is then used to estimate the conductivity of the wafer. This process results in a new contactless conductivity measurement system that exhibits a very wide conductivity measurement vary and allows the characterization of a big variety of semiconductor materials. The device is also very quick doubtless permitting the measurement of transport properties of semiconductors in fast transient conditions. As a practical example, the performance of our device is demonstrated by estimating the conductivity of a collection of crystalline silicon wafers.


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