Patent ID: 8816506
Filing Date: 2014-08-26
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate having a main surface and a back surface positioned on an opposite side to the main surface; a first insulating film formed on the main surface of the semiconductor substrate; a first hole formed in the first insulating film; a second hole formed in the back surface of the semiconductor substrate; a bump electrode disposed over the first insulating film and having a protruding portion which is formed at least in the first hole and which reaches the inside of the semiconductor substrate in a cross-sectional view; a second insulating film formed on a side surface of the second hole; and a conductive film formed in the second hole and electrically connected to the bump electrode, wherein, in a planar view, a diameter of the protruding portion is smaller than a diameter of the second hole; and wherein the conductive film is connected to a side surface and a bottom surface of the protruding portion; wherein the first hole is entirely filled with the bump electrode; and wherein the second hole is not entirely filled with the conductive film.