An Ohmic contact is a type of electrical contact that allows current to flow easily in both directions with minimal resistance. It is characterized by a linear current-voltage (I-V) relationship, which means that the current flowing through the contact is directly proportional to the applied voltage. This behavior is in contrast to rectifying contacts, which only allow current to flow in one direction.
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A contact with approximately linear, nonrectifying current–voltage behavior and suitably low contact resistance in its operating range.