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김광수

Kim, Kwang S.
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Anomalous Ambipolar Transport of Organic Semiconducting Crystals via Control of Molecular Packing Structures

Author(s)
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
Issued Date
2017-08
DOI
10.1021/acsami.7b05129
URI
https://scholarworks.unist.ac.kr/handle/201301/22716
Fulltext
http://pubs.acs.org/doi/abs/10.1021/acsami.7b05129
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.
Publisher
AMER CHEMICAL SOC
ISSN
1944-8244
Keyword (Author)
van der Waals substrateshexagonal boron nitride (h-BN)organic/h-BN heterostructuresambipolar charge transportorganic field-effect transistors
Keyword
FIELD-EFFECT TRANSISTORSTHIN-FILM TRANSISTORSSCANNING-TUNNELING-MICROSCOPYPOLYMER GATE DIELECTRICSSOURCE-DRAIN ELECTRODESSURFACE VISCOELASTICITYPENTACENE MOLECULESEPITAXIAL-GROWTHLARGE-AREAPERFORMANCE

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