3 research outputs found
High-frequency performance of scaled carbon nanotube array field-effect transistors
We report the radio-frequency performance of carbon nanotube array
transistors that have been realized through the aligned assembly of highly
separated, semiconducting carbon nanotubes on a fully scalable device platform.
At a gate length of 100 nm, we observe output current saturation and obtain
as-measured, extrinsic current gain and power gain cut-off frequencies,
respectively, of 7 GHz and 15 GHz. While the extrinsic current gain is
comparable to the state-of-the-art the extrinsic power gain is improved. The
de-embedded, intrinsic current gain and power gain cut-off frequencies of 153
GHz and 30 GHz are the highest values experimentally achieved to date. We
analyze the consistency of DC and AC performance parameters and discuss the
requirements for future applications of carbon nanotube array transistors in
high-frequency electronics.Comment: 15 pages, 4 figures + Supplementary Informatio
Diameter Refinement of Semiconducting Arc Discharge Single-Walled Carbon Nanotubes via Density Gradient Ultracentrifugation
Arc
discharge single-walled carbon nanotubes (SWCNTs) possess superlative
optical and electronic properties that are of high interest for technologically
important applications including fiber optic communications, biomedical
imaging, and field-effect transistors. However, as-grown arc discharge
SWCNTs possess a mixture of metallic and semiconducting species in
addition to a wide diameter distribution (1.2 to 1.7 nm) that limit
their performance in devices. While previous postsynthetic sorting
efforts have achieved separation by electronic type and diameter refinement
for metallic arc discharge SWCNTs, tight diameter distributions of
semiconducting arc discharge SWCNTs have not yet been realized. Herein,
we present two advances in density gradient ultracentrifugation that
enable the isolation of high purity (>99%) semiconducting arc discharge
SWCNTs with narrow diameter distributions centered at ∼1.6
and ∼1.4 nm. The resulting diameter-refined populations of
semiconducting arc discharge SWCNTs possess monodisperse characteristics
that are well-suited for high-performance optical and electronic technologies