Jiangsu Key Laboratory of Optoelectronic Information Functional Materials, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
Abstract: The application of semiconductor field effect transistors (FETs) in sensors is one of the hottest research topics in the field of sensing. As represented by AlGaN/GaN high electron mobility transistors (HEMTs), FET sensors have obvious advantages in terms of detection limit, sensitivity, specificity, and ease of operation and integration. As the core technique in the device fabrication, the functionalization of the devices plays an important role in realizing the above functions and advantages, which also has great potential for the subsequent development of devices. This review summarizes the domestic and foreign research progress of the gate functionalization methods of AlGaN/GaN HEMT-based sensors for detecting gas, solution ions, and biological substances separately. Finally, we point out the limitations and shortcomings of some existing treatment methods, and look forward to some aspects of future research.
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