Patent ID: 6221770
Filing Date: 2001-04-24
Classification: C23C

Abstract:
A chemical vapor deposition method of depositing a titanium nitride film over a nitrided titanium film on a substrate comprising:depositing titanium nitride on a substrate in an initial step in a titanium tetrachloride depletion CVD mode with titanium tetrachloride flowing at a flow rate of about 20 sccm, with ammonia flowing at a flow rate of about 500 sccm and with nitrogen flowing at a flow rate of about 5 liters per minute as a diluent to thereby form a thin layer of TiN about 100 to 500 angstroms thick; andfollowing the forming of the thin layer of TiN by the initial step, increasing the flow rate of titanium tetrachloride to a flow rate in a saturation regime of about 80 sccm with the flow rates of ammonia and of nitrogen remaining constant, whereby there is deposited over the thin layer a further layer of TiN having a conformality of about 100%.