Patent ID: 8877535

Claim:
A method for forming a vertical type sensor, comprising the steps of: providing a substrate having a surface formed with a first electrode layer thereon; forming a sensing layer on the first electrode layer, wherein the sensing layer is reactive to a target substance; applying a plurality of first nanoparticles on the sensing layer in a manner that a portion of a top surface of the sensing layer is exposed from the plurality of first nanoparticles; forming a second electrode layer on the portion of the top surface of the sensing layer and exposed from the sensing layer, wherein the sensing layer is interposed between the first electrode layer and the second electrode layer; removing the plurality of first nanoparticles and forming a plurality of openings in the second electrode layer for exposing the sensing layer, wherein the target substance contacts the sensing layer via the plurality of openings; and forming an inert semiconductor layer on the first electrode layer before forming the sensing layer.