Patent ID: 7235428
Filing Date: 2007-06-26
Classification: H01L

Abstract:
1. A semiconductor device production method comprising the steps of: forming a stopper mask layer of a first metal on a semiconductor substrate, the stopper mask layer having an opening at a predetermined portion thereof; supplying a second metal into the opening of the stopper mask layer to form a projection electrode of the second metal; removing the stopper mask layer after the metal supplying step; planarizing a surface of the stopper mask layer and a surface of a portion of the second metal present in the opening by polishing to provide a continuous and flat surface after the step of supplying a second metal; partly removing the metal portion present in the opening to form a recess above the metal portion after the planarization step; and forming a low melting point metal layer of a low melting point metal in a region including the recess, the low melting point metal having a lower solidus temperature than the projection electrode.