Contact spacing controls the on-current for all-carbon field effect transistors

Abstract All-carbon field-effect transistors, which combine carbon nanotubes and graphene hold great promise for many applications such as digital logic devices single-photon emitters. However, the understanding of physical properties nanotube (CNT)/graphene hybrid systems in remained limited. In this combined experimental theoretical study, we use a quantum transport model transistors based on electrodes CNT channels to explain experimentally observed low currents. We find that large graphene/CNT spacing short contact lengths limit device performance. have also elucidated work ambipolar behavior caused by flat conduction- valence-bands describe non-ideal gate-control contacts channel region capacitance nanotube. hope our insights will accelerate design efficient all-carbon transistors.