Patent ID: 9153697
Filing Date: 2015-10-06
Classification: H01L

Abstract:
1. A semiconductor device provided with: a first planar layer comprising a first planar semiconductor layer, a second planar semiconductor layer, and a planar insulating layer separating the first and second planar semiconductor layers; a first columnar semiconductor layer on the first planar semiconductor layer; a first semiconductor layer in the first planar semiconductor layer and in a lower region of the first columnar semiconductor layer; a second semiconductor layer of a same conductive type as the first semiconductor layer in an upper region of the first columnar semiconductor layer; a first gate insulating film on a sidewall of the first columnar semiconductor layer between the first semiconductor layer and the second semiconductor layer and surrounding the first columnar semiconductor layer; a first gate electrode comprising a first metal film on the first gate insulating film and surrounding the first gate insulating film, and a first semiconductor film on the first metal film and surrounding the first metal film; a first insulating film overlying the planar insulating layer and between the first gate electrode and the first planar semiconductor layer, the first insulating film comprising an insulating material different from the first gate insulating film; a second insulating film having a sidewall shape and contacting an upper sidewall of the first columnar semiconductor layer and a top surface of the first gate electrode so as to surround the upper region of the first columnar semiconductor layer; a third insulating film having a sidewall shape and contacting a sidewall of the first insulating film and the first gate electrode so as to surround the first gate electrode and the first insulating film, the third insulating film separated from the second insulating film by the first gate electrode; a first contact above the first columnar semiconductor layer; a second contact above the first planar semiconductor layer; and a third contact coupled to the first gate electrode; wherein the first gate insulating film and the first metal film are surrounded by the first columnar semiconductor layer, the first semiconductor layer, the first insulating film and the second insulating film.