Patent ID: 6294468
Filing Date: 2001-09-25
Classification: C23C,H01L

Abstract:
A method for depositing tungsten on a semiconductor substrate comprising the steps of:receiving the semiconductor substrate at a first deposition station within a chemical vapor deposition chamber having a plurality of discrete deposition stations;heating the semiconductor substrate to a temperature between about 360 and about 390 degrees centigrade;introducing initiation gases into the first deposition station to form an amorphous, monolayer of silicon, wherein the initiation gases comprise a silane (SiH.sub.4) gas flow of about 40 to about 48 standard cubic centimeters per minute;introducing nucleation gases into the first deposition station to form a silane reduced tungsten layer, wherein the nucleation gases comprise a silane gas flow of about 20 to about 30 standard cubic centimeters per minute and a tungsten hexafluoride (WF.sub.6) gas flow of about 300 to about 350 standard cubic centimeters per minute;introducing a hydrogen reducing gas flow to form a layer of hydrogen reduced bulk tungsten, wherein the hydrogen reducing gas flow comprises a hydrogen gas flow of about 7,000 to about 8,500 standard cubic centimeters per minute and a tungsten hexafluoride gas flow of about 300 to about 350 standard cubic centimeters per minute; anddepositing at successive deposition stations a bulk, hydrogen reduced tungsten.