Patent ID: 6784063
Filing Date: 2004-08-31
Classification: H01L

Abstract:
A method for fabricating a BiCMOS transistor, comprising the steps of:forming a field oxide film for device isolation and a buried oxide film on a semiconductor substrate; forming a well where a MOS transistor is to be formed and a collector of a bipolar transistor on the semiconductor substrate; forming a gate insulating film on the semiconductor substrate; forming a gate electrode of the MOS transistor and an external base of the bipolar transistor on the gate insulating film; forming a nitride film for a spacer on oxide film 64 for the base spacer; removing the nitride film for the spacer in the bipolar transistor region; selectively forming a silicon layer and a polysilicon layer in the bipolar transistor region; forming an insulating film on the polysilicon layer; forming a spacer on the sides of the gate electrode of the MOS transistor and on the sides of the external base of the bipolar transistor; and forming a source/drain of the MOS transistor.