Patent ID: 8410530

Claim:
A sensitive field effect transistor apparatus comprises: an inorganic ion sensitive field effect transistor; and an inorganic reference field effect transistor connected to the inorganic ion sensitive field effect transistor to form the sensitive field effect transistor apparatus, wherein the inorganic reference field effect transistor, comprises : a semiconductor substrate of a p-type silicon chip, a p-well formed in the p-type silicon chip: a second electrode being formed in the p-well, the second electrode including a second source, a second drain and a second p-type ion; a second metal wire being connected to a surface of the second electrode; a second silicon dioxide being formed on a surface of the p-type silicon chip between the second electrode and the second metal wire; a second hydrogen ion sensitive membrane being formed on a surface of the p-well, wherein the second hydrogen ion sensitive membrane comprises silicon nitride; and a second photo resistance layer being formed on a surface of the second silicon dioxide and a surface of the second metal wire.