Patent ID: 7192837
Filing Date: 2007-03-20
Classification: H01L

Abstract:
1. A method for manufacturing a MOSFET device, the method comprising: forming a shallow trench isolation in a substrate; farming a first oxide layer on a surface of an active region of the substrate and implanting ions thereinto for forming a lightly doped drain in the active region prior to the formation of a gate; forming a first nitride layer; removing a part of the first nitride layer and the first oxide layer and etching the substrate corresponding to the part, including the tightly doped drain, by a depth of about 200 to about 1000 angstroms to define a gate region; forming a second oxide layer aver an exposed portion of the substrate; implanting ions into the substrate; removing the second oxide layer; depositing a gate insulating layer and a polysilicon layer into the removed parts of the first nitride layer and the first aid do layer; polishing until the first nitride layer is exposed; removing the first nitride layer, depositing an oxide layer conformally and depositing a second nitride layer; etching the second nitride layer to form a gate sidewall; implanting ions into the substrate to form a source and drain at locations which are deeper than that of the lightly doped drain and at sides of the gate; and removing an exposed oxide layer.