Patent ID: 8669601
Filing Date: 2014-03-11
Classification: H01L

Abstract:
1. A method for producing a semiconductor device comprising: a pillar-shaped semiconductor-forming step of forming a first pillar-shaped semiconductor and a second pillar-shaped semiconductor on a substrate at the same time so as to have the same height; a pillar-shaped semiconductor bottom-connecting step of forming a first semiconductor layer by doping, with a donor or acceptor impurity, at least one of a bottom region of the first pillar-shaped semiconductor and a region that contacts the bottom region at a lower position to connect the first semiconductor layer and the second pillar-shaped semiconductor to each other; a circuit element-forming step of forming a circuit element including an upper semiconductor region by doping an upper region of the first pillar-shaped semiconductor with a donor or acceptor impurity to form the upper semiconductor region; a conductor layer-forming step of forming a first conductor layer in the second pillar-shaped semiconductor; a contact hole-forming step of forming a first contact hole and a second contact hole that are respectively connected to the first pillar-shaped semiconductor and the second pillar-shaped semiconductor; a wiring metal layer-forming step of forming a wiring metal layer that is connected to each of the upper semiconductor region and the first conductor layer through the first contact hole and the second contact hole, respectively; a step of forming a first insulating layer so as to surround the first pillar-shaped semiconductor; and a pillar-shaped-semiconductor-connecting conductor layer-forming step of forming a pillar-shaped-semiconductor-connecting conductor layer so as to surround the first insulating layer and the second pillar-shaped semiconductor and to connect the first pillar-shaped semiconductor to the second pillar-shaped semiconductor.