Patent ID: 8168498
Filing Date: 2012-05-01
Classification: H01L

Abstract:
1. A method for manufacturing an insulated-gate type semiconductor device in which a gate-purpose conductive layer is embedded into a trench which is formed in a major surface of a semiconductor substrate, and a source-purpose conductive layer is provided on said major surface, comprising: a step of forming a first semiconductor region within said semiconductor substrate; a step of forming a trench in said semiconductor substrate in such a manner that said trench penetrates said first semiconductor region; a step of forming a gate insulating film on a surface of said first semiconductor region which is exposed within said trench; a step in which a gate pillar made of both said gate-purpose conductive layer and a cap insulating film capping an upper surface of said gate-purpose conductive layer is formed in the trench where said gate insulating film is formed, and a portion of said gate pillar is projected from the major surface of said semiconductor substrate; a step of forming a second semiconductor region within said first semiconductor region which is segmented by said trench; a step of forming a side wall spacer on both said gate-purpose conductive layer and said cap insulating film of said projected portion of said gate pillar; and a step of forming said source-purpose conductive layer in a source contact region defined by said side wall spacer.