(B) Physical characteristics of gridless flexible triac transistor used for magnetic force sensing (c) Schematic diagram of working principle of force magnetic sensing (d) Source under different pressure Leakage current variation (e) Source and drain current variations at different magnetic field strengths (f) Finger pressure sensor controls LED lamp brightness demonstration pressure sensing (g) Magnet proximity sensor controls LED brightness display Magnetic field strength sensing.
In recent years, the rapid development of mobile Internet and smart terminals has stimulated the research of smart sensing technologies in the fields of human-computer interaction, artificial intelligence and wearable devices, etc. At the same time, due to the characteristics of low cost and large scale of field effect transistors Is widely used in the field of electronic devices, human-computer interaction and health monitoring, etc. However, the conventional field-effect transistor needs to be connected with an electric signal through the gate electrode for sensing and control, the preparation process of the gate electrode is complicated and easily damaged, and to a certain extent On the limits of its development in wearable smart devices.
In 2014, the research group led by Wang Zhonglin, chief scientist of the Chinese Academy of Sciences Beijing Institute of Nano-Energy and Systems, and Zhang Chi, a researcher at Chinese Academy of Sciences, for the first time, proposed a new research field of triboelectronics using the electrostatic potential generated by friction as the gate signal To control the electrical transmission and conversion characteristics of the semiconductor can be used for information sensing and control of the initiative to achieve a variety of human-computer interactive functional devices such as electromechanical coupling logic, touch electroluminescence, contact mechatronics, Enhanced photoelectric conversion, intelligent touch switch, active tactile imaging system, electronic skin, flexible transparent transistor, etc. In recent years, Friction Electronics has been widely concerned and followed by scholars at home and abroad, becoming a hot research field in the field of flexible electronics.
Recently, the research team worked with Dong Guifang, an associate professor of chemistry at Tsinghua University, to develop a flexible, organic triac-free transistor with a gate electrode. Researchers used a movable friction layer to directly contact and electrify the dielectric layer to achieve The transistor source-drain regulation, the device can be used to sense the tactile pressure and magnetic field strength, to achieve the sensitivity of 21% Pa-1 and 16% mT-1, and better than 120ms response time, with good stability And durability.The device based on the dielectric layer and the external direct contact electrification instead of the traditional gate voltage sensing mechanism can effectively simplify the transistor gate electrode preparation process to avoid damage to the gate electrode due to device bending increase it as The stability and durability of sensors have established a direct interaction mechanism with external environment stimuli and have broad application prospects in human-machine interface, electronic skin, wearable electronic devices and smart sensing.
Relevant research results published in the ACS Nano.
