Patent ID: 8999739
Filing Date: 2015-04-07
Classification: G01N,H01L

Abstract:
1. A method of forming a sensor, comprising: disposing a silicon sensing fin on a buried oxide layer of a substrate to form a channel of undoped silicon for providing a current flow between a source region and a drain region, each of the source region and the drain region comprising heavily doped silicon; depositing a dielectric layer and a metal oxide on one or more sides and a top of the sensing fin, the dielectric layer and the metal oxide forming a sensing surface on the silicon sensing fin; depositing a passive surface over the buried oxide layer and surrounding, adjacent to, or around the sensing fin, a material of the passive surface being different from a material of the sensing surface; modifying the sensing surface opposite the substrate with a compound bound to the sensing surface on the sensing fin and not bound to the passive surface, the compound having a ligand specifically configured to preferentially bind a target biomolecule; and causing a change in current flow between the source region and the drain region to sense the target biomolecule on the sensing surface.