Abstract
In this brief, we discuss our top-gate-effect-based high-sensitivity amorphous InGaZnO4 thin-film transistor (a-InGaZnO TFT) pH sensor system. The pH sensor system consists of an a-InGaZnO TFT pH sensor and a driving circuit that was designed to bring out the high-sensitivity performance of the sensor. We present a primary demonstration for the a-InGaZnO TFT pH sensor system that has the potential for accurately detecting stepwise pH changes as small as 0.02.
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