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"Two-dimensional charge
transport in self-organized, high-mobility conjugated polymers,"
by H. Sirringhaus and 10 others, Nature, 401(6754):685-8, 14
October 1999.
[University of Cambridge, U.K.; Riso
National Lab., Roskilde, Denmark; Eindhoven University of Technology,
Netherlands; Philips Research Labs, Eindhoven, Netherlands]
Abstract:
"Self-organization in many solution-processed, semiconducting
conjugated polymers results in complex microstructures, in which
ordered microcrystalline domains are embedded in an amorphous matrix.
This has important consequences for electrical properties of these
materials: charge transport is usually limited by the most difficult
hopping processes and is therefore dominated by the disordered matrix,
resulting in low charge-carrier mobilities....Here we use thin-film,
field-effect transistor structures to probe the transport properties
of the ordered microcrystalline domains in the conjugated polymer
poly(3-hexylthiopene), P3HT. Self-organization in P3HT results in a
lamella structure with two-dimensional conjugated sheets formed by
interchain stacking. We find that, depending on processing conditions,
the lamellae can adopt two different orientations--parallel and normal
to the substrate--the mobilities of which differ by more than a factor
of 100, and can reach values as high as 0.1 cmV-1s-1. Optical
spectroscopy of the field-induced charge, combined with the mobility
anisotropy, reveals the two-dimensional interchain character of the
polaronic charge carriers, which exhibit lower relaxation energies
than the corresponding radical cations on isolated one-dimensional
chains. The possibility of achieving high mobilities via
two-dimensional transport in self-organized conjugated lamellae is
important for applications of polymer transistors in logic circuits
and active matrix displays."
This 1999 report from Nature,
from a team that includes conjugated-polymer pioneer Richard H. Friend
of the University of Cambridge, was cited 19 times in
current journal articles indexed in the ISI database during May-June
2001. No other paper in chemistry, apart from reviews, was cited as
many times during that two-month period. Prior to the most recent
bimonthly count, citations to the paper have accrued as follows:
March-April 2001: 12
January-February 2001: 4
November-December 2000: 1
September-October 2000: 4
July-August 2000: 3
May-June 2000: 3
March-April 2000: 3
Total citations to date: 49
SOURCE: Hot
Papers Database (Available from the ISI
Research Services Group in a CD-ROM version containing data on
hundreds of highly cited papers published during the last two years.
User interface permits searching by author, organization, journal,
field, and more. Total citations, as well as citations accrued during
successive bimonthly periods, can be assessed and graphed. Database is
combined with subscription to the ISI newsletter Science
Watch®; updated discs containing the
most recent bimonthly data are mailed with each new issue, six times a
year.)
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