Patent ID: 6350683
Filing Date: 2002-02-26
Classification: H01L

Abstract:
A method of forming a tungsten layer having a high film density, which at least fills a hole of an insulation layer, said method comprising the steps of:carrying out a first chemical vapor deposition process for growing a micro crystal tungsten thin film on at least an inside face of the hole; and carrying out a second chemical vapor deposition process for growing a tungsten layer from said micro crystal tungsten thin film so that said tungsten layer at least fills said hole, wherein said second chemical vapor deposition process is carried out at a substrate temperature of not less than 475Â° C. and at a growth chamber pressure in the range of 90 Torr to 150 Torr, so that said tungsten layer has a high film density; wherein said first chemical vapor deposition process is carried out at a substrate temperature which is lower than said second chemical vapor deposition process.