Patent ID: 9459234
Filing Date: 2016-10-04
CPC Classification: C12Q,G01N,H01L

Claim Text:
1. A BioFET device, comprising: a substrate having an active region comprising a semiconductor material; a gate structure disposed on a first surface of the semiconductor material of the substrate; a source region and a drain region in the semiconductor material, wherein a channel region interposes the source and drain region; an isolation layer disposed over a second surface of the semiconductor material of the substrate, the second surface opposing the first surface, wherein the isolation layer includes an opening over a first portion of the second surface in the channel region and wherein the isolation layer covers a second portion of the second surface in the channel region and the isolation layer covers the second surface in each of the source region and drain region; and an interface layer formed on the second surface of the substrate in the opening, wherein the interface layer includes a metal layer that is directly on the second surface of the semiconductor material of the channel region, wherein a top surface of the interface layer is below a top surface of the isolation layer.