Abstract:
A method for etching a polysilicon gate structure in a plasma etch chamber is provided. The method initiates with defining a pattern protecting a polysilicon film to be etched. Then, a plasma is generated. Next, substantially all of the polysilicon film that is unprotected is etched. Then, a silicon containing gas is introduced and a remainder of the polysilicon film is etched while introducing a silicon containing gas. An etch chamber configured to introduce a silicon containing gas during an etch process is also provided.
Abstract:
A METHOD FOR ETCHING A POLYSILICON GATE STRUCTURE IN A PLASMA ETCH CHAMBER IS PROVIDED. THE METHOD INITIATES WITH DEFINING A PATTERN PROTECTING A POLYSILICON FILM TO BE ETCHED.THEN, A PLASMA IS GENERATED. NEXT, SUBSTANTIALLY ALL OF THE POLYSILICON FILM THAT IS UNPROTECTED IS ETCHED. THEN, A SILICON CONTAINING GAS IS INTRODUCED AND A REMAINDER OF THE POLYSILICON FILM IS ETCHED WHILE INTRODUCING A SILICON CONTAINING GAS. AN ETCH CHAMBER CONFIGURED TO INTRODUCE A SILICON CONTAINING GAS DURING AN ETCH PROCESS IS ALSO PROVIDED.