Fabrication and electrical properties of single wall carbon nanotube channel and graphene electrode based transistors arrays

Abstract

A transistor structure composed of an individual single-walled carbon nanotube (SWNT) channel with a graphene electrode was demonstrated. The integrated arrays of transistor devices were prepared by transferring patterned graphene electrode patterns on top of the aligned SWNT along one direction. Both single and multi layer graphene were used for the electrode materials; typical p-type transistor and Schottky diode behavior were observed, respectively. Based on our fabrication method and device performances, several issues are suggested and discussed to improve the device reliability and finally to realize all carbon based future electronic systems.

Band Alignment at Au/MoS2 Contacts: Thickness Dependence of Exfoliated Flakes

“…The thickness of a MoS 2 flake was identified via AFM height profiles (Figure b) and micro-Raman spectra (Figure c). A MoS 2 flake with a known thickness could thus be transferred from SiO 2 to Au using a PMMA-mediated transfer technique Figure a shows that a flake could be successfully transferred from one substrate to the other without significantly altering the flake, such that it can be considered to be “identical” before and after the transfer.…”

Analysis of contact resistance in single-walled carbon nanotube channel and graphene electrodes in a thin film transistor

“…As a member of the carbon allotropes, Graphene has emerged as an alternative electrode material for CNT devices due to its flexibility, exceptional electric transport, and potential for the seamless contact with CNT. While there have been several experimental and theoretical studies on the graphene/SWCNT junction properties, relatively few studies have been reported values of contact resistance in graphene/SWCNT junctions [ 6 , 7 ].…”

Ultralow Percolation Threshold in Nanoconfined Domains

“…P ercolation is of paramount importance in electrically active nanocarbon composites and hybrid electronic devices where single-walled carbon nanotubes (SWNTs) and graphene enable charge transport across the network. 1,2 Examples of the importance of such percolated networks can be found in flexible electrodes, field-effect transistors, hybrid photovoltaic solar cells, and flexible supercapacitors. 2−5 The minimum amount of interconnected subunits necessary to form a percolated network that enables transport of electricity across the system is called the percolation threshold, ϕ c .…”

“…Percolation is of paramount importance in electrically active nanocarbon composites and hybrid electronic devices where single-walled carbon nanotubes (SWNTs) and graphene enable charge transport across the network. , Examples of the importance of such percolated networks can be found in flexible electrodes, field-effect transistors, hybrid photovoltaic solar cells, and flexible supercapacitors. − The minimum amount of interconnected subunits necessary to form a percolated network that enables transport of electricity across the system is called the percolation threshold, ϕ c . − A central question in percolated systems is how to lower ϕ c in order to reduce the amount of materials, to ease processing, and to enhance electrical properties by minimizing bundle formation. , Recently, it was found that reducing the nanotube loading in bulk heterojunction photovoltaic solar cells enabled a decrease in series resistance and an overall enhancement in power conversion efficiency due to better charge transport and extraction . Moreover, a growing number of applications require device miniaturization, formation of nanostructured domains, and the use of highly purified and expensive to produce semiconducting nanotubes to prevent electrical shorts or exciton quenching, e .…”