Patent ID: 10211340

Abstract:
The method for producing a pillar-shaped semiconductor device includes a step of providing a structure that includes, on an i layer substrate (1a), a Si pillar (4a) and an impurity region (12a) located in a lower portion of the Si pillar (4a) and serving as a source or a drain, a step of forming a SiO2 layer that extends in a horizontal direction and is connected to an entire periphery of the impurity region (12a) in plan view, a step of forming a SiO2 layer (11a) on the SiO2 layer such that the SiO2 layer (11a) surrounds the Si pillar (4a) in plan view, a step of forming a resist layer (13) that is partly connected to the SiO2 layer (11a) in plan view, and a step of forming a SiO2 layer (8a) by etching the SiO2 layer below the SiO2 layer (11a) and the resist layer (13) using the SiO2 layer (11a) and the resist layer (13) as masks.