Current crowding on metal contacts to planar devices

Abstract
A simple transmission line model is applied to the contact region between metal and diffusion layer in planar devices. Taking into account the sheet resistance of the diffusion layer and an ohmic specific contact resistance between metal and semiconductor the theoretical current distribution across the contact is calculated and compared with the results obtained with a model suggested by Kennedy and Murley. Experimental data are given that confirm the validity of the transmission line model.

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