title: Linear increases in carbon nanotube density through multiple transfer technique.
abstract: We present a technique to increase carbon nanotube (CNT) density beyond the as-grown CNT density. We perform multiple transfers, whereby we transfer CNTs from several growth wafers onto the same target surface, thereby linearly increasing CNT density on the target substrate. This process, called transfer of nanotubes through multiple sacrificial layers, is highly scalable, and we demonstrate linear CNT density scaling up to 5 transfers. We also demonstrate that this linear CNT density increase results in an ideal linear increase in drain-source currents of carbon nanotube field effect transistors (CNFETs). Experimental results demonstrate that CNT density can be improved from 2 to 8 CNTs/μm, accompanied by an increase in drain-source CNFET current from 4.3 to 17.4 μA/μm.
authors.affiliation: Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States. maxms@stanford.edu
authors.forename: Max M
authors.initials: MM
authors.lastname: Shulaker
authors.forename: Hai
authors.initials: H
authors.lastname: Wei
authors.forename: Nishant
authors.initials: N
authors.lastname: Patil
authors.forename: J
authors.initials: J
authors.lastname: Provine
authors.forename: Hong-Yu
authors.initials: HY
authors.lastname: Chen
authors.forename: H-S P
authors.initials: HS
authors.lastname: Wong
authors.forename: Subhasish
authors.initials: S
authors.lastname: Mitra