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Proceedings Paper

Mass transport of lithium ions intercalated in pyrene-functionalized single-walled carbon nanotubes: a facile way to Schottky diode
Author(s): Hee Cheul Choi; Hyunseob Lim
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Paper Abstract

Single-walled carbon nanotubes (SWNTs) have been investigated as a key potential candidate for high performance electronic devices. Two representative device forms are carbon nanotube based field effect transisotors (FETs) and diodes. In contrast of high popularity of FET devices for the fundamental studies as well as applications, carbon nanotube based diodes have been rarely studied. Recently, we developed a facile chemical route to realize the SWNT Schottky diode via mass transport of lithium ions by applying bias voltages on 1-pyrenemethylamine(1-PMA) functionalized SWNTs in which lithium ions were intercalated. The intercalated Li ions were transported and reduced on the drain electrode, of which work function was then significantly modulated. Because the modulated work function induces large Schottky barrier between the drain electrode and SWNT, the current of reversed direction is effectively blocked while the forward direction current flows through the relatively small Schottky barrier. The migration of lithium ions was characterized by scanning photoelectron microscopy (SPEM) and space resolved x-ray photoelectron spectroscopy. To measure the intensity of Li 1s XPS peak, the population of lithium ions was observed along the nanotube axis from the source to drain electrodes. As a result, the highest population of lithium was observed at near the drain electrode. This approach using the concept of mass transport of lithium ions to modulate the metal contact characteristics is a simple and promising process that can be further applied not only to SWNT-based electronics but also to various nanomaterial-based electronic devices.

Paper Details

Date Published: 4 September 2008
PDF: 10 pages
Proc. SPIE 7037, Carbon Nanotubes and Associated Devices, 70370U (4 September 2008); doi: 10.1117/12.792712
Show Author Affiliations
Hee Cheul Choi, Pohang Univ. of Science and Technology (South Korea)
Hyunseob Lim, Pohang Univ. of Science and Technology (South Korea)

Published in SPIE Proceedings Vol. 7037:
Carbon Nanotubes and Associated Devices
Manijeh Razeghi; Didier Pribat; Young Hee Lee, Editor(s)

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