Patent ID: 9722048
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A method of making a semiconductor device, the method comprising: disposing a first doped semiconductor layer on a substrate; disposing an un-doped semiconductor layer on the first doped semiconductor layer; disposing a second doped semiconductor layer on the un-doped semiconductor layer; disposing an inter-layer dielectric (ILD) on the second doped semiconductor layer; removing a portion of the ILD, the second doped semiconductor layer, and the un-doped semiconductor layer to form a trench that extends from a surface of the ILD to the un-doped semiconductor layer; removing the un-doped semiconductor layer by a selective etch process such that the first doped semiconductor layer and the second doped semiconductor layer remain substantially intact and to form a horizontal opening between the first doped semiconductor layer and the second doped semiconductor layer; and depositing a metal to fill the trench in the ILD and the horizontal opening to form a metal layer between the first doped semiconductor layer and the second doped semiconductor layer, the first doped semiconductor layer, the metal layer, and the second doped semiconductor layer forming a source.