Patent ID: 6410432
Filing Date: 2002-06-25
Classification: C23C,H01L

Abstract:
A method of depositing a tantalum (Ta) barrier film and a tantalum nitride (TaNx) barrier film on a semiconductor device substrate having a temperature in the range of about 300Â° C.-500Â° C., the method comprising depositing said Ta film by a plasma enhanced CVD process including providing a vapor of a tantalum pentachloride precursor to a reaction chamber containing said substrate by heating said precursor to a temperature sufficient to vaporize said precursor and combining said vapor in said reaction chamber with a process gas consisting essentially of hydrogen and optionally one or more of argon and helium, and generating a plasma in said combined vapor and process gas and reacting said combined vapor and process gas in the presence of said plasma to deposit said Ta, and depositing said TaNx film by a CVD process selected from the group consisting of: (a) thermal CVD including combining said vapor above said substrate with a process gas consisting essentially of nitrogen and hydrogen and optionally one or more of argon and helium by providing said process gas to said reaction chamber concurrently with providing said vapor to said reaction chamber to deposit said TaNx, and (b) plasma enhanced CVD including combining said vapor above said substrate with a process gas consisting essentially of N2 and H2 and optional inert gases to deposit said TaNx wherein the deposit Ta and TaNx films each contain less than 2 atomic percent chlorine.