Patent ID: 8278208
Filing Date: 2012-10-02
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising: forming a first insulation layer on a semiconductor substrate; forming a first plug in the first insulation layer on the semiconductor substrate; forming a second insulation layer on the first plug and the first insulation layer; etching the second insulation layer to expose the first plug and recess a portion of the first insulation layer adjoining the first plug so as to expose side and upper surfaces of an upper portion of the first plug; and forming a second plug on the first plug and on the recessed portion of the first insulation layer so as to contact the side and upper surfaces of the upper portion of the first plug, the second plug having a first portion contacting an upper surface of the first plug and a second portion contacting the side surface of the first plug, wherein a lower surface of the second portion of second plug extends below a lower surface of the first portion of the second plug.