Patent ID: 8021934
Filing Date: 2011-09-20
Classification: H01L

Abstract:
1. A method for making a field effect transistor comprising at least the following steps: making a structure on a substrate, said structure comprising at least a portion of a semiconductor material forming a channel of the field effect transistor, a gate located on the channel and a hard mask located on the gate; forming at least one dielectric portion completely covering said structure and zones of the substrate corresponding to locations of a source and a drain of the field effect transistor and a peripheral zone at said locations, and comprising an approximately plane face opposite a face in contact with the substrate, said forming including, making two holes in the dielectric portion on each side of said structure, such that the locations of the source and the drain form bottom walls of the two holes and sides of the channel are exposed; depositing a first metallic layer on at least the bottom walls of the two holes, at least covering said sides of the channel; siliciding said sides of the channel; depositing a second metallic layer on the first metallic layer to form the source and the drain of the field effect transistor in conjunction with the silicided sides of the channel; and chemical-mechanical polishing the second metallic layer stopping on the hard mask.