title: Carbon nanotube feedback-gate field-effect transistor: suppressing current leakage and increasing on/off ratio.
abstract: Field-effect transistors (FETs) based on moderate or large diameter carbon nanotubes (CNTs) usually suffer from ambipolar behavior, large off-state current and small current on/off ratio, which are highly undesirable for digital electronics. To overcome these problems, a feedback-gate (FBG) FET structure is designed and tested. This FBG FET differs from normal top-gate FET by an extra feedback-gate, which is connected directly to the drain electrode of the FET. It is demonstrated that a FBG FET based on a semiconducting CNT with a diameter of 1.5 nm may exhibit low off-state current of about 1 × 10(-13) A, high current on/off ratio of larger than 1 × 10(8), negligible drain-induced off-state leakage current, and good subthreshold swing of 75 mV/DEC even at large source-drain bias and room temperature. The FBG structure is promising for CNT FETs to meet the standard for low-static-power logic electronics applications, and could also be utilized for building FETs using other small band gap semiconductors to suppress leakage current.
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University , Beijing 100871, China.
authors.forename: Chenguang
authors.initials: C
authors.lastname: Qiu
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Zhang
authors.forename: Donglai
authors.initials: D
authors.lastname: Zhong
authors.forename: Jia
authors.initials: J
authors.lastname: Si
authors.forename: Yingjun
authors.initials: Y
authors.lastname: Yang
authors.forename: Lian-Mao
authors.initials: LM
authors.lastname: Peng
keywords: carbon nanotube; field-effect transistor; gate engineering; low static power