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

Process Simulation of Diesel into Aromatics and Carbon Nanotubes: A Techno and Economic Analyses

“…In addition, the large amount of C 1 –C 5 paraffin byproducts also affects the economy of the process. On the other hand, the chemical vapor deposition (CVD) method is mature enough to convert hydrocarbons, including methane − , olefins, LPG, , etc., into carbon nanotubes (CNTs). − CNTs are a type of high-end nanomaterials and are finding wide applications as additives to Li-ion batteries, , catalyst supports, electrode materials of supercapacitors, , and reinforced and conductive components in composites made of polymers, metals, and ceramics. − However, most of the studies have focused on the quality control of CNTs but not yet on the production of hydrogen. ,,, (see Table )…”

Manipulating electron waves in graphene using carbon nanotube gating

“…Moreover, the CNT shape can be controlled to some extent [34,35] allowing for flexible design of the waveguide geometry. Recent advancement in the fabrication of nanostructures, and, in particular, efficient transfer and manipulation of CNTs for the assembly of nanodevices [36][37][38][39][40], opens up possibilities for precise control over the CNT position and orientation. Using CNT as a gate for graphene has been proposed in theoretical works [41][42][43] as well as realized experimentally in the capacitive measurement of graphene's local density of states [44] and Coulomb drag between graphene and CNT [45].…”