Patent ID: 7268064

Claim:
A method of forming a polysilicon film of a semiconductor device, the method comprising, (a) loading a semiconductor substrate into a deposition chamber; (b) flowing a SiH 4 or Si 2 H 6 gas into the deposition chamber at a flow rate of at least 1000 sccm and flowing a PH 3 gas into the deposition chamber to form a doped polysilicon film on the semiconductor substrate; and (c) stopping the inflow of the PH 3 gas and reducing the inflow of the SiH 4 or Si 2 H 6 gas to 150 sccm to 250 sccm in order to form an undoped polysilicon film on the doped polysilicon film, while maintaining a temperature of the interior of the deposition chamber, in a range of 500° C. to 550° C. during steps (b) and (c).