This paper presents a new configuration of an electric field sensor, named “Differential Electric-Field Sensitive Field Effect Transistor” (DeFET). The new configuration which has different gate distances of DeFET is designed to detect tiny particles. The new design can be used in environmental applications such as one can detect carbon dioxide concentration in air. This paper also reviews the DeFET’s theory of operation and presents simulation which confirms the basic idea of the DeFET.

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