Patent ID: 8415242
Filing Date: 2013-04-09
Classification: H01L

Abstract:
1. A method of manufacturing a nonvolatile semiconductor memory device having a plurality of memory strings, in which a plurality of transistors having gate electrode films formed on sides of columnar semiconductor films via charge storage layers are connected in series in a height direction of the columnar semiconductor films, the method comprising: forming a first stacked film in which a predetermined number of spacer films made of an insulative material and the predetermined number of electrode films made of a conductive material are alternately stacked; forming a first through hole piercing through the first stacked film and a coupling hole connecting lower portions of a pair of the first through holes adjacent to each other in a predetermined direction in a lower portion of the first stacked film; forming a germanium film or a silicon germanium film on insides of the first through hole and the coupling hole; and performing heat treatment at temperature equal to or higher than a melting point of germanium and equal to or lower than a melting point of silicon.