The term contact resistance refers to the contribution to the total resistance of a material which comes from the electrical leads and connections as opposed to the intrinsic resistance, which is an inherent property, independent of the measurement method. The idea of potential drop on the injection electrode was introduced by William Shockley to explain the difference between the experimental results and the model of gradual channel approximation. The name "contact resistance" was decided for the consideration of the metal–semiconductor interface as a main contribution to this phenomenon. Beside that also "interface resistance", "transitional resistance", or just simply "correction term" were used. Therefore was later used term "parasitic resistance" as a more general term, where it is usually still assumed that the contact resistance has a major contribution.
Read more about Contact Resistance: Experimental Characterization, Quantum Limit, Other Forms of Contact Resistance, Significance
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