Patent ID: 6703287
Filing Date: 2004-03-09
Classification: H01L

Abstract:
A method for producing a semiconductor device having a shallow trench isolation, said method including:a first step of forming an oxide film and a nitride film successively on a semiconductor substrate in which an object part and a chip peripheral part including a dicing part are to be formed; a second step of patterning said oxide film and nitride film so that an opening is formed in a portion of said chip peripheral part where a photo-related mark is to be formed and in a portion of said object part where a trench is to be formed; a third step of etching a surface of said semiconductor substrate with the use of said patterned oxide film and nitride film as a mask so as to form said trench and to form a recess in the portion where said photo-related mark is to be formed; a fourth step of forming a plasma oxide film on said semiconductor substrate so as to fill said recess and said trench; a fifth step of forming a resist film on said plasma oxide film so as to cover said trench part and a portion of a neighborhood of said photo-related mark; a sixth step of selectively etching said plasma oxide film with the use of said resist film as a mask so as to leave an overpolish-preventing support member in the neighborhood of said photo-related mark for providing a support member against overpolishing of the neighborhood of said photo-related mark during subsequent chemical mechanical polishing; a seventh step of removing said resist film; an eight step of polishing the surface of said semiconductor substrate by chemical mechanical polishing; and a ninth step of removing said nitride film and oxide film.