title: Field Emission of Wet Transferred Suspended Graphene Fabricated on Interdigitated Electrodes.
abstract: Suspended graphene (SG) membranes could enable strain-engineering of ballistic Dirac fermion transport and eliminate the extrinsic bulk disorder by annealing. When freely suspended without contact to any substrates, graphene could be considered as the ultimate two-dimensional (2D) morphology, leading to special field characteristics with the 2D geometrical effect and effectively utilized as an outstanding structure to explore the fundamental electronic or optoelectronic mechanism. In this paper, we report field emission characterization on an individual suspended few-layer graphene. A controllable wet transfer method is used to obtain the continuous and suspended graphene membrane on interdigitated gold electrodes. This suspended structure displays an overall field emission from the entirely surface, except for the variation in the emitting positions, acquiring a better enhancement than the exfoliated graphene on the conventional flat substrate. We also observe the transition process from space charge flow at low bias to the Fowler-Nordheim theory at high current emission regime. It could enable theoretical and experimental investigation of the typical electron emission properties of the 2D regime. Numerical simulations are also carried out to study the electrical properties of the suspended structure. Further improvement on the fabrication would realize low disorder, high quality, and large-scale suspended graphene devices.
authors.affiliation: School of Electronic Science and Engineering, Southeast University , Nanjing, 210096, China.
authors.forename: Ji
authors.initials: J
authors.lastname: Xu
authors.affiliation: School of Electronic Science and Engineering, Southeast University , Nanjing, 210096, China.
authors.forename: Qilong
authors.initials: Q
authors.lastname: Wang
authors.affiliation: School of Electronic Science and Engineering, Southeast University , Nanjing, 210096, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Tao
authors.affiliation: School of Electronic Science and Engineering, Southeast University , Nanjing, 210096, China.
authors.forename: Zhiyang
authors.initials: Z
authors.lastname: Qi
authors.affiliation: School of Electronic Science and Engineering, Southeast University , Nanjing, 210096, China.
authors.forename: Yusheng
authors.initials: Y
authors.lastname: Zhai
authors.affiliation: School of Electronic Science and Engineering, Southeast University , Nanjing, 210096, China.
authors.forename: Shengqi
authors.initials: S
authors.lastname: Wu
authors.affiliation: School of Electronic Science and Engineering, Southeast University , Nanjing, 210096, China.
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Electronic Science and Engineering, Southeast University , Nanjing, 210096, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lei
keywords: Fowler−Nordheim tunneling; annealing; field emission; space charge; suspended graphene