Patent ID: 7897509
Filing Date: 2011-03-01
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device on a semiconductor wafer comprising: a hollow tubular trench formed at a position to form a through-hole electrode of a silicon wafer; an insulating member buried inside the trench and on an upper surface of the silicon wafer surrounded by the trench; a conducting film formed on an upper surface of the insulating member; a conducting member formed on the conducting film; and an external connection electrode formed electrically connected to the conducting film via the conducting member, the method comprising steps of: thinning the semiconductor wafer from its back surface and exposing the insulating member buried inside the trench; dissolving the insulating member inside and on an upper surface of the trench by wet etching; and forming a silicon hole part reaching the conducting film by dropping a silicon piece of an inner surface of the trench.