Patent ID: 8679885

Claim:
A method of forming a semiconductor structure for sensing biomolecules, said method comprising: forming a blanket layer of a hard mask material on an uppermost surface of a semiconductor substrate; patterning the blanket layer of hard mask material providing a first hard mask portion and a second hard mask portion on said uppermost surface of the semiconductor substrate, wherein a portion of said uppermost surface of the semiconductor substrate is exposed; etching the exposed portion of said uppermost surface of the semiconductor substrate providing a V-shaped opening within said semiconductor substrate and exposing surfaces of the semiconductor substrate that are located beneath the uppermost surface of the semiconductor substrate; forming a gate dielectric on a sidewall surface of each hard mask portion and on the exposed surfaces of the semiconductor substrate within the V-shaped opening; forming a sacrificial gate material on said gate dielectric; removing the first and second hard mask portions exposing portions of the uppermost surface of the semiconductor substrate that are located adjacent said V-shaped opening; forming a source region in one of the exposed portions of the semiconductor substrate and forming a drain region in another of said exposed portions of the semiconductor substrate; forming a first insulator cap portion atop the source region and a second insulator cap portion atop the drain region; and removing an entirety of the sacrificial gate material.