Patent ID: 8486788
Filing Date: 2013-07-16
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor device, the method comprising: forming a trench region at a predetermined position in a device formation region having a principal surface so that the trench region has a recessed shape with a bottom portion located at a lower position than the principal surface of the device formation region and side surfaces connected to the bottom portion; forming source/drain regions containing an impurity in the trench region so that the source/drain regions are buried in the trench region; forming a semiconductor FIN structure in the trench region so that the semiconductor FIN structure is buried in the trench region, is located between the source/drain regions, and has a raised shape having an upper surface and side surfaces and extending upward from a bottom surface of the trench region; forming a gate insulating film on the side and upper surfaces of the semiconductor FIN structure so that the gate insulating film covers the side and upper surfaces; forming a gate electrode on the side and upper surfaces of the semiconductor FIN structure with the gate insulating film interposed therebetween; forming an insulating film in the trench region so that the trench region is not completely filled; and forming a semiconductor layer on the insulating film in the trench region so that the trench region is completely filled, wherein the upper surface of the semiconductor FIN structure does not protrude from the principal surface of the device formation region, and the semiconductor layer is a part of the semiconductor FIN structure.