Patent ID: 6239029
Filing Date: 2001-05-29
Classification: H01L

Abstract:
A method of forming a contact to a substrate, said method comprising:providing an active region in said substrate, wherein a junction depth is defined as the maximum depth of said doped active region in a direction perpendicular to a plane defined by said substrate;forming an insulating layer over said substrate;forming in said insulating layer a contact opening extending to said active region, said contact opening having a bottom and at least one sidewall;exposing a silicon dioxide layer on said substrate over said active area to germane gas so as to react with and remove said silicon dioxide layer from said substrate, and to form a germanium layer at said bottom of said contact opening and over said active region; andforming a refractory metal layer over said germanium layer, said refractory metal layer having a thickness that is less than about one-half of said junction depth.