Patent ID: 9035455
Filing Date: 2015-05-19
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor chip; a wiring formed on the semiconductor chip; an insulating film, coating the wiring and having an opening for partially exposing the wiring from the insulating film; a first film made of Ti and W, formed on a portion of the wiring facing the opening; a Cu layer, formed on the first film and on a portion of the wiring exposed through the insulating film, and having a peripheral edge portion thereof protruding away from the opening more than a peripheral edge of the first film in a direction parallel to a surface of the insulating film; and a solder ball bonded to the Cu layer, wherein a distance between the surface of the insulating film and the Cu layer is fixed, a protrusion amount of the peripheral edge portion of the Cu layer with respect to the peripheral edge of the first film is greater than a thickness of the first film, and the Cu layer is stacked high enough that a surface of the first film does not vertically surpass the upper surface of the Cu layer in the center of the opening.