Patent ID: 8748300
Filing Date: 2014-06-10
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: forming a first stacked body on a substrate, the first stacked body including a plurality of electrode layers and a plurality of first insulating layers alternately stacked on each other; forming a select gate on the first stacked body and a second insulating layer on the select gate to form a second stacked body; forming a first hole through the first stacked body in a stacking direction; forming a second hole through the second stacked body in a stacking direction, the second hole connected to the first hole and; broadening a hole diameter of the second hole surrounded by the second insulating layer to be larger than a hole diameter of the second hole surrounded by the select gate to form a step part between a side face of the select gate and the second insulating layer; forming a first channel body inside the first hole; forming a second channel body inside the second hole, the second channel body being connected to the first channel body; implanting an impurity into a portion of the second channel body covering the step part by ion implantation; expanding a volume of the implanted portion of the second channel body; and forming a semiconductor portion inside the second channel body above a portion where the second channel body is volume-expanded, the semiconductor portion containing an impurity.