Patent ID: 6399487
Filing Date: 2002-06-04
Classification: H01L

Abstract:
A selective contacting process comprising:providing a silicon body having a top surface which includes at least one area of silicon oxide; depositing a layer of silicon-germanium alloy, containing between 50 and 69.9 atomic percent of germanium, on the silicon top surface; depositing a layer of titanium on said silicon-germanium layer; subjecting the silicon body to a first rapid thermal anneal, thereby causing the titanium that is in contact with said silicon-germanium layer to form a layer of titanium-silicon-germanium alloy having a first sheet resistance value; selectively removing all unreacted titanium; and subjecting said silicon body to a second rapid thermal anneal for between about 20 and 40 seconds at a temperature between 650 and 699.9Â° C., whereby a change in crystalline form occurs and said titanium-silicon-germanium alloy has its resistivity reduced to between about 15 and 20 micro-ohm-cm.