Patent ID: 6924198
Filing Date: 2005-08-02
Classification: H01L

Abstract:
1. A method for fabricating a MOSFET, comprising: forming a hard mask on a surface of a semiconductor; etching a trench in the semiconductor through an opening in the hard mask; forming a first insulating layer inside the trench; introducing a gate material into the trench, wherein the first insulating layer is between the gate material and the semiconductor; forming a body region and a source region in the semiconductor adjacent to the trench; oxidizing the gate material to form a second insulating layer overlying a remaining portion of the gate material, wherein the hard mask limits oxidation to areas that the hard mask exposes; removing the hard mask; depositing a third insulating layer; etching an opening in the third insulating layer to expose the source region; and depositing a contact material in the opening in the third insulating layer to thereby form a contact plug making electrical contact to the source region, wherein depositing the contact material comprises depositing a metal layer at a pressure of about two atmospheric pressures.