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Kim, Kwang S.
Center for Superfunctional Materials (CSM)
Research Interests
  • Theoretical/experimental nanosciences, molecular electronics spectroscopy, energy materials

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Anomalous Ambipolar Transport of Organic Semiconducting Crystals via Control of Molecular Packing Structures

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Title
Anomalous Ambipolar Transport of Organic Semiconducting Crystals via Control of Molecular Packing Structures
Author
Park, BeomjinKim, KyunghunPark, JaesungLim, HeeseonLanh, Phung ThiJang, A-RangHyun ChoheeMyung, Chang WooPark, SeungkyooKim, Jeong WonKim, Kwang S.Shin, Hyeon SukLee, GeunsikKim, Se HyunPark, Chan EonKim, Jin Kon
Keywords
ambipolar charge transport; hexagonal boron nitride (h-BN); organic field-effect transistors; organic/h-BN heterostructures; van der Waals substrates
Issue Date
201708
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.9, no.33, pp.27839 - 27846
Abstract
Organic crystals deposited on 2-dimensional (2D) van der Waals substrates have been widely investigated due to their unprecedented crystal structures and electrical properties. van der Waals interaction between organic molecules and the substrate induces epitaxial growth of high quality organic crystals and their anomalous crystal morphologies. Here, we report on unique ambipolar charge transport of a “lying-down” pentacene crystal grown on a 2D hexagonal boron nitride van der Waals substrate. From in-depth analysis on crystal growth behavior and ultraviolet photoemission spectroscopy measurement, it is revealed that the pentacene crystal at the initial growth stage have a lattice-strained packing structure and unique energy band structure with a deep highest occupied molecular orbital level compared to conventional “standing-up” crystals. The lattice-strained pentacene few layers enable ambipolar charge transport in field-effect transistors with balanced hole and electron field-effect mobilities. Complementary logic circuits composed of the two identical transistors show clear inverting functionality with a high gain up to 15. The interesting crystal morphology of organic crystals on van der Waals substrates is expected to attract broad attentions on organic/2D interfaces for their electronic applications.
URI
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DOI
http://dx.doi.org/10.1021/acsami.7b05129
ISSN
1944-8244
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