Patent ID: 8536626
Filing Date: 2013-09-17
Classification: G01N,H01L

Abstract:
1. A pH sensor comprising: a substrate including a base substrate and a cap formed over the base substrate; an ion sensitive field effect transistor (ISFET) die comprising an ion sensing part that responds to pH, wherein the ISFET die is located over the substrate; a protective layer formed over at least a first portion of an outer surface of the ISFET die and at least a portion of the substrate, wherein the protective layer is not formed over at least a second portion of the outer surface of the ISFET die; a frit material formed at least partially in a sidewall region between the ISFET die and the cap, wherein the protective layer is formed over at least a portion of the frit material in the sidewall region and over at least a portion of the cap; and a cover member mechanically coupled to the protective layer, wherein the cover member houses the ISFET die and the substrate, and wherein the cover member defines an opening proximate to the ion sensing part.