Patent ID: 9719959
Date: 2017-08-01
CPC Classifications: G01N

Claim:
1. A hydrogen ion sensor comprising: a substrate having a well and a first contact, the well having a second, a third, a fourth and a fifth contacts, the second contact having the same conductive type as the well, and the third, the fourth, and the fifth contacts having an opposite conductive type to the well; a first gate insulation layer on a region between the fourth contact and the fifth contact; a second gate insulation layer on a region between the third contact and the fourth contact; and a hydrogen ion sensing unit on the first gate insulation layer, wherein the hydrogen ion sensing unit transfers a voltage level adjusted according to a hydrogen ion concentration of a solution to be measured, to the first gate insulation layer, wherein the second and the fifth contacts are disposed apart on the well, wherein the third contact is disposed between the second contact and the fourth contact, wherein the fourth contact is disposed between the third contact and the fifth contact, and wherein the fourth contact surrounds the fifth contact in a ring shape.