Patent ID: 6129950
Filing Date: 2000-10-10
Classification: C23C,H01L

Abstract:
A method of forming a thick polysilicon layer by using a chemical vapor deposition system, thc method comprising the steps of:providing a substrate;introducing a first gas to form a first doped polysilicon layer on the substrate;stopping the first gas;introducing a second gas into the chemical vapor deposition system to ensure that no residual first gas lingers in the system;introducing a third gas after the second gas to form a first oxide layer having a thickness of about 5-20 .ANG. on the first doped polysilicon layer;stopping the third gas;introducing the second gas into the chemical vapor deposition system to ensure that no residual third gas lingers in the system; andrepeating the steps described above to form a doped second polysilicon layer, a second oxide layer having a thickness of about 5-20 .ANG. and a doped third polysilicon layer.