Ultrahigh Vacuum Self-Assembly of Rotationally Commensurate C8-BTBT/MoS 2 /Graphene Mixed-Dimensional Heterostructures

Xiaolong Liu, Itamar Balla, Vinod K. Sangwan, Hakan Usta, Antonio Facchetti, Tobin J Marks, Mark C Hersam

Research output: Contribution to journalArticle

Abstract

Mixed-dimensional van der Waals heterostructures combine the advantages of nanomaterials with qualitatively distinct properties such as the extended bandstructures and high charge carrier mobilities of inorganic two-dimensional materials and the discrete orbital energy levels and strong optical absorption of zero-dimensional organic molecules. The synergistic interplay between nanomaterials of distinct dimensionality has enabled a variety of unique applications such as antiambipolar transistors, sensitized photodetectors, and gate-tunable photovoltaics. Because the performance of mixed-dimensional heterostructure devices depends sensitively on the buried interfacial structure, it is of great interest to identify materials and chemistries that naturally form highly ordered heterointerfaces. Toward this end, here we demonstrate ultrahigh vacuum self-assembly of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) monolayers onto epitaxial MoS 2 /graphene heterostructures. With molecular-resolution scanning tunneling microscopy and spectroscopy, the resulting C8-BTBT/MoS 2 /graphene mixed-dimensional heterostructures are found to be rotationally commensurate with well-defined physical and electronic structures. It is further shown that the self-assembled C8-BTBT monolayers are insensitive to the structural defects and electronic perturbations of the underlying MoS 2 substrate, which provides significant processing latitude. For these reasons, this work will facilitate ongoing efforts to utilize organic/MoS 2 /graphene mixed-dimensional heterostructures for electronic, optoelectronic, and photovoltaic applications.

Original languageEnglish
Pages (from-to)1761-1766
Number of pages6
JournalChemistry of Materials
Volume31
Issue number5
DOIs
Publication statusPublished - Mar 12 2019

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Ultrahigh vacuum
Self assembly
Graphene
Heterojunctions
Nanostructured materials
Monolayers
Carrier mobility
Scanning tunneling microscopy
Photodetectors
Charge carriers
Optoelectronic devices
Light absorption
Electron energy levels
Electronic structure
Transistors
Spectroscopy
Defects
Molecules
Substrates

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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Ultrahigh Vacuum Self-Assembly of Rotationally Commensurate C8-BTBT/MoS 2 /Graphene Mixed-Dimensional Heterostructures . / Liu, Xiaolong; Balla, Itamar; Sangwan, Vinod K.; Usta, Hakan; Facchetti, Antonio; Marks, Tobin J; Hersam, Mark C.

In: Chemistry of Materials, Vol. 31, No. 5, 12.03.2019, p. 1761-1766.

Research output: Contribution to journalArticle

Liu, Xiaolong ; Balla, Itamar ; Sangwan, Vinod K. ; Usta, Hakan ; Facchetti, Antonio ; Marks, Tobin J ; Hersam, Mark C. / Ultrahigh Vacuum Self-Assembly of Rotationally Commensurate C8-BTBT/MoS 2 /Graphene Mixed-Dimensional Heterostructures In: Chemistry of Materials. 2019 ; Vol. 31, No. 5. pp. 1761-1766.
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