Electrical resistance introduced by a connection between conducting regions. Interface chemistry, contact geometry and microscopic barriers can dominate over the bulk resistance of the connected materials. Four-terminal measurements help separate contact drops from the resistance of a test section.
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Contact resistance refers to the resistance to current flow that occurs at the interface between two conductive materials, such as metal contacts or between a conductor and a semiconductor. This resistance is typically very small compared to the bulk resistance of the materials involved, but it can significantly affect the overall performance of electronic devices, electrical connections, and circuits.