Patent ID: 9685499
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. A method for forming a capacitive device, the method comprising: forming a buffer layer on a substrate; forming a nanosheet stack on the buffer layer, wherein the nanosheet stack includes alternating layers of a first semiconductor material and a second semiconductor material; removing portions of the nanosheet stack and the buffer layer to form a first fin and a second fin; depositing a first insulator layer on the substrate; implanting ions in the first fin and the second fin and annealing to form a first electrode and a second electrode; removing the first insulator layer; removing portions of the buffer layer in the first electrode and the second electrode to form a void between the first electrode and the substrate and a void between the second electrode and the substrate; depositing a second insulator layer on the substrate and in the void under the first electrode and the void under the second electrode; and forming a first metallic conductive contact on a basal end of the first electrode and a second metallic conductive contact on a basal end of the second electrode.