Patent ID: 6121097
Filing Date: 2000-09-19
Classification: H01L,Y10S

Abstract:
A semiconductor device manufacturing method, comprising the steps of:forming a first insulating film on a silicon element substrate in an SOI substrate by thermal oxidation of said silicon element substrate, wherein said SOI substrate includes a support substrate, said silicon element substrate, and a separating insulating film between said silicon element substrate and said support substrate;etching said silicon element substrate to form a trench, said trench having a bottom formed by a portion of said separating insulating film, and at least one side wall formed by at least one portion of said silicon element substrate;depositing a first polysilicon film upon a surface of said bottom, a surface of each of said at least one side wall of said trench, and said first insulating film;etching said first polysilicon film on said insulating film and on said bottom of said trench, using an anisotropic etching technique, to expose said first insulating film and a portion of said bottom, and to leave a portion of said polysilicon on said at least one side wall of said trench;etching and removing said exposed first insulating film; anddepositing an oxidized insulating film on said silicon element substrate and in said trench, using chemical vapor deposition, to isolate said silicon element substrate.