Patent ID: 6455420
Filing Date: 2002-09-24
Classification: H01L

Abstract:
A method for making a semiconductor device in which a compound film of a semiconductor and a metal is formed on a surface of a semiconductor region, said method comprising the sequential steps of:forming a metal film over said semiconductor region; then, annealing said metal film at a first temperature effective to generate a silicide layer having a first resistance as said compound film; then, forming an interlayer insulating film over said compound film; then, forming a connection hole in said insulating film; then, introducing an impurity in a region of said semiconductor region exposed via a bottom surface of said connection hole through said connection hole; then, annealing said semiconductor device a second time at a second temperature higher than the first temperature, said second annealing at said second time effective to activate said impurity and effective to impact to said compound film a second resistance which is lower than said first resistance, wherein said annealing at said second time is performed at a temperature of 750Â° C. to 900Â° C. for 5 to 60 sec; and then, after annealing said semiconductor device a second time, depositing at least one metal layer on said semiconductor device.