Patent ID: 9041086
Filing Date: 2015-05-26
Classification: H01L

Abstract:
1. A vertical field effect transistor comprising: a pillar projecting upwardly from semiconductor material of a substrate, the pillar comprising an upper portion of semiconductor material that is conductively doped effective to form a first of two source/drain regions of the vertical transistor, the pillar comprising a lower portion of semiconductor material that is effectively doped to form a channel region of the vertical transistor; a gate dielectric received radially about the channel region of the pillar; conductive gate material received radially about the gate dielectric; and a second of the two source/drain regions of the vertical transistor being L-shaped in vertical cross section, the L-shaped second source/drain region comprising a horizontally oriented L-base segment comprising conductively doped semiconductor material beneath the pillar which extends laterally relative to the pillar, the L-shaped second source/drain region comprising a vertically oriented L-stem segment of conductively doped semiconductor material connected with the L-base segment and extending upwardly parallel the pillar, the vertically oriented L-stem segment being longer in length than the L-base segment.