Patent ID: 8530307

Claim:
A method of fabricating a semiconductor device comprising: forming bit lines in a semiconductor substrate; forming insulating film lines on the bit lines to successively run in a length direction of the bit lines; forming gate electrodes above the semiconductor substrate between the bit lines; forming word lines on the gate electrodes to run in a width direction of the bit lines; forming a trench region between the bit lines and between the word lines in the semiconductor substrate wherein forming the trench region includes etching the semiconductor substrate by using at least the insulating film lines as an etching mask; and forming an insulating film layer on the trench region; forming the bit lines includes implanting ions in the semiconductor substrate having openings formed in a first metal layer, of which the gate electrodes are to be composed; and wherein forming the insulating film lines includes forming a layer of the insulating film lines on the openings and on the first metal layer, and polishing the layer of the insulating film lines to the first metal layer.