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Patterning Organic Semiconductor Single
Crystal Field-Effect Transistors
S. Liu1, A. Briseno,2 S.C.B. Mannsfeld,1 J. Locklin,1 W. You, H. Lee, Y. Xia,2 Z. Bao,1 A. Sharei, S. Liu,1 M.E.
Roberts1
1Stanford University and 2University of Washington, Berkeley
Single-crystal organic field-effect transistors
(OFETs) are ideal device structures for studying
fundamental science associated with charge
transport in organic materials and have
demonstrated outstanding electrical
characteristics. However, it remains a technical
challenge to integrate single-crystal devices into
practical electronic applications. A key difficulty is
that organic single-crystal devices are usually
fabricated one device at a time through manual
selection and placing individual crystals. To
overcome this difficulty, Bao et al. successfully
developed two high-throughput approaches to
pattern organic single crystal arrays. In the first
method, organic crystals are patterned on
electrode regions through solution (de)wetting on
heterogeneously wettability-patterned
substrates. This solution processing technique
potentially has very low-cost. In the second
approach, organic semiconductors are vapordeposited on substrates using carbon nanotubes
as templates. In both techniques, large arrays of
single crystals OFETs with superior performance
are successfully fabricated.
Fig.1 Schematic of the solution-based patterning process
(left) and scanning electron micrographs (SEM) of patterned
single crystal OFETs (right).
a
Fig.2 Schematic of the vapor patterning process (left) and
10images
μm of patterned organic single crystals.
SEM
Stanford University MRSEC 0213618
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