Patent ID: 8860128
Filing Date: 2014-10-14
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first-conductive type first silicon pillar: a first dielectric surrounding a side surface of the first silicon pillar; a gate surrounding the dielectric and a gate depletion layer extending in the first-conductive type first silicon pillar; a second silicon pillar underneath the first silicon pillar; and a third silicon pillar on a top of the first silicon pillar, and comprising a second-conductive type high-concentration impurity region, wherein the second silicon pillar includes a second-conductive type high-concentration impurity region in a surface thereof except at least a part of a contact surface region with the first silicon pillar, and includes a first-conductive type impurity region therein and surrounded by the second-conductive type high-concentration impurity region of the second silicon pillar, and wherein the first-conductive type impurity region has a length greater than that of a source/drain depletion layer extending from a base portion of the second-conductive type high-concentration impurity region of the second silicon pillar and the source/drain depletion layer is spaced apart from the gate depletion layer.