Interface Engineering to Optimize Metal III-V contacts in FET devices

摘要

Techniques for fabricating self-aligned contacts in III-V FET devices are provided. A method for fabricating a self-aligned contact to III-V materials includes the steps of depositing at least one metal on a surface of a III-V material 102, the metal is reacted with an upper portion of the III-V material to form a metal III-V alloy layer 106 which is the self-aligned contact, an etch is used to remove any unreacted portions of the metal, at least one impurity is implanted into the metal III-V alloy layer, the impurity implanted into the metal III-V alloy layer is diffused to an interface between the metal III-V alloy layer and the III-V material to reduce the contact resistance of the self-aligned contact. The reaction may involve an annealing step.