Patent ID: 8883593

Claim:
A method of manufacturing a device, the method comprising: forming a semiconductor pillar having a first conductivity type protruding from a semiconductor substrate; forming a bottom diffusion layer having a second conductivity type in the semiconductor substrate around a bottom of the semiconductor pillar; forming a gate insulator film covering a side surface of the semiconductor pillar; forming a gate electrode covering the gate insulator film; and forming a top diffusion later having the second conductivity type at a top portion of the semiconductor pillar, the top diffusion layer including a semiconductor body is formed by an epitaxial growth which contains an impurity, wherein the forming the semiconductor pillar is to form a first semiconductor pillar and a second semiconductor pillar, the first semiconductor pillar including an n-type impurity being disposed in an n-well region and the second semiconductor pillar including a p-type impurity being disposed in a p-well region; wherein the forming the bottom diffusion layer further comprises: forming a first mask layer which covers the n-well region; forming, with the first mask layer as a mask, a second diffusion layer by implanting a n-type impurity in the semiconductor substrate around a bottom of the second semiconductor pillar which is in the p-well region; removing the first mask layer; forming a second mask layer which covers the p-well region; forming, with the second mask layer as a mask, a first diffusion layer by implanting a p-type impurity in the semiconductor substrate around a bottom of the first semiconductor pillar which is in the n-well region; and removing the second mask layer; and wherein the forming the top diffusion layer further comprises: forming a third mask layer which covers the n-well region; forming a fourth diffusion layer by an epitaxial growth of a semiconductor which includes an n-type impurity at a top portion of the second semiconductor pillar; forming an insulating layer over the fourth diffusion layer; removing the third mask layer; and forming a third diffusion layer by an epitaxial growth of a semiconductor which includes a p-type impurity at a top portion of the first semiconductor pillar.