Enabling Oxygen Gas Detection via Graphene-Nanoribbon FET (GNRFET) on 6H-SiC Substrate Utilizing a Catalytic Gate Electrode

This work presented the Graphene-nanoribbon FET (GNRFET) as a highly effective gas detector. In order to mitigate potential fabrication challenges associated with the double gate configuration of the GNRFET, an alternative approach involving a single gate GNR deposited on the 6H-SiC material is introduced. The gate electrode is constructed using a catalytic metal, namely Ag, which facilitates the attraction of oxygen molecules, leading to a modulation of the gate workfunction. The proposed gas detector is subjected to comprehensive testing across varying concentrations of oxygen molecules. The assessment of its efficiency incorporates three distinct parameters: threshold voltage sensitivity, ON current sensitivity, and OFF current sensitivity. These criteria jointly assess the effectiveness of the recommended oxygen detector. The results indicate that the proposed detector effectively detects various oxygen molecules. Furthermore, the study delves into the influence of factors like gate length and channel doping concentration. An exploration of these variables reveals their impact on the detector`s functionality. The acquired results offer valuable insights into the interplay between these variables and the detector’s performance, thereby enriching our understanding of its behavior.