A Graphene-Based Vacuum Transistor with a High ON/OFF Current Ratio

• Published in: Advanced functional materials Vol. 25; no. 37; pp. 5972 - 5978
• Main Authors: Wu, Gongtao, Wei, Xianlong, Zhang, Zhiyong, Chen, Qing, Peng, Lianmao
• Format: Journal Article
• Language: English
• Published: Blackwell Publishing Ltd 01.10.2015
• Subjects: Electric potential; Emitters (electron); Graphene; high ON/OFF ratio; Semiconductor devices; Slopes; Switching; Transistors; vacuum microelectronics; vacuum transistors; Voltage
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.201502034

A graphene‐based vacuum transistor (GVT) with a high ON/OFF current ratio is proposed and experimentally realized by employing electrically biased graphene as the electron emitter. The states of a GVT are switched by tuning the bias voltage applied to the graphene emitter with an ON/OFF current ratio up to 106, a subthreshold slope of 120 mV dec−1 and low working voltages of <10 V, exhibiting switching performances superior to those of previously reported graphene‐based solid‐state transistors. GVTs are fabricated and integrated using silicon microfabrication technology. A perfectly symmetric ambipolar device is achieved by integrating two GVTs, implying the potential of realizing vacuum integrated circuits based on GVTs. GVTs are expected to find applications in extreme environments such as high temperature and intense irradiation. Graphene‐based transistors with an ON/OFF current ratio up to 106 and a subthreshold slope of 120 mV dec−1 are developed by employing a vacuum channel. These transistors exhibit switching performances superior to those of graphene‐based transistors with solid‐state mediums for carrier transport.