Surface-Directed Molecular Assembly of Pentacene on Monolayer Graphene for High-Performance Organic Transistors

We demonstrate that polymer residues remaining on graphene surfaces induce a stand-up orientation of pentacene, thereby controlling pentacene growth such that the molecular assembly is optimal for charge transport

Wi Hyoung Lee; Jaesung Park; Sung Hyun Sim; Soojin Lim; Kwang S. Kim; Byung Hee Hong; Kilwon Cho

2011

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  • We demonstrate that polymer residues remaining on graphene surfaces induce a stand-up orientation of pentacene, thereby controlling pentacene growth such that the molecular assembly is optimal for charge transport
  • Epitaxial growth of pentacene having molecular assembly of lying-down structure is facilitated by π−π interaction between pentacene and the clean graphene electrode without polymer residues, which adversely affects lateral charge transport at the interface between electrode and channel
  • Our studies provide that the obtained high field-effect mobility in pentacene field-effect transistors using monolayer graphene electrodes arises from the extrinsic effects of polymer residues as well as the intrinsic characteristics of the highly conductive, ultrathin two-dimensional monolayer graphene electrodes
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