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Title: Rotational superstructure in van der Waals heterostructure of self-assembled C 60 monolayer on the WSe 2 surface

Abstract

Hybrid van der Waals (vdW) heterostructures composed of two-dimensional (2D) layered materials and self-assembled organic molecules are promising systems for electronic and optoelectronic applications with enhanced properties and performance. Control of molecular assembly is therefore paramount to fundamentally understand the nucleation, ordering, alignment, and electronic interaction of organic molecules with 2D materials. Here, we report the formation and detailed study of highly ordered, crystalline monolayers of C 60 molecules self-assembled on the surface of WSe 2 in well-ordered arrays with large grain sizes (~5 μm). Using high-resolution scanning tunneling microscopy (STM), we observe a periodic 2 × 2 superstructure in the C 60 monolayer and identify four distinct molecular appearances. Using vdW-corrected ab initio density functional theory (DFT) simulations, we determine that the interplay between vdW and Coulomb interactions as well as adsorbate–adsorbate and adsorbate–substrate interactions results in specific rotational arrangements of the molecules forming the superstructure. The orbital ordering through the relative positions of bonds in adjacent molecules creates a charge redistribution that links the molecule units in a long-range network. Furthermore, this rotational superstructure extends throughout the self-assembled monolayer and opens a pathway towards engineering aligned hybrid organic/inorganic vdW heterostructures with 2D layered materials in a precise andmore » controlled way.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2]
  1. Queen's Univ., Belfast (United Kingdom)
  2. Arizona State Univ., Tempe, AZ (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1395061
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 9; Journal Issue: 35; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; self-assembly; C60; two-dimensional materials; scanning tunneling microscopy; density functional theory

Citation Formats

Santos, Elton J. G., Scullion, Declan, Chu, Ximo S., Li, Duo O., Guisinger, Nathan P., and Wang, Qing Hua. Rotational superstructure in van der Waals heterostructure of self-assembled C60 monolayer on the WSe2 surface. United States: N. p., 2017. Web. doi:10.1039/C7NR03951D.
Santos, Elton J. G., Scullion, Declan, Chu, Ximo S., Li, Duo O., Guisinger, Nathan P., & Wang, Qing Hua. Rotational superstructure in van der Waals heterostructure of self-assembled C60 monolayer on the WSe2 surface. United States. doi:10.1039/C7NR03951D.
Santos, Elton J. G., Scullion, Declan, Chu, Ximo S., Li, Duo O., Guisinger, Nathan P., and Wang, Qing Hua. Wed . "Rotational superstructure in van der Waals heterostructure of self-assembled C60 monolayer on the WSe2 surface". United States. doi:10.1039/C7NR03951D. https://www.osti.gov/servlets/purl/1395061.
@article{osti_1395061,
title = {Rotational superstructure in van der Waals heterostructure of self-assembled C60 monolayer on the WSe2 surface},
author = {Santos, Elton J. G. and Scullion, Declan and Chu, Ximo S. and Li, Duo O. and Guisinger, Nathan P. and Wang, Qing Hua},
abstractNote = {Hybrid van der Waals (vdW) heterostructures composed of two-dimensional (2D) layered materials and self-assembled organic molecules are promising systems for electronic and optoelectronic applications with enhanced properties and performance. Control of molecular assembly is therefore paramount to fundamentally understand the nucleation, ordering, alignment, and electronic interaction of organic molecules with 2D materials. Here, we report the formation and detailed study of highly ordered, crystalline monolayers of C60 molecules self-assembled on the surface of WSe2 in well-ordered arrays with large grain sizes (~5 μm). Using high-resolution scanning tunneling microscopy (STM), we observe a periodic 2 × 2 superstructure in the C60 monolayer and identify four distinct molecular appearances. Using vdW-corrected ab initio density functional theory (DFT) simulations, we determine that the interplay between vdW and Coulomb interactions as well as adsorbate–adsorbate and adsorbate–substrate interactions results in specific rotational arrangements of the molecules forming the superstructure. The orbital ordering through the relative positions of bonds in adjacent molecules creates a charge redistribution that links the molecule units in a long-range network. Furthermore, this rotational superstructure extends throughout the self-assembled monolayer and opens a pathway towards engineering aligned hybrid organic/inorganic vdW heterostructures with 2D layered materials in a precise and controlled way.},
doi = {10.1039/C7NR03951D},
journal = {Nanoscale},
number = 35,
volume = 9,
place = {United States},
year = {2017},
month = {8}
}

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    Works referencing / citing this record:

    Interface Characterization and Control of 2D Materials and Heterostructures
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    Interface Characterization and Control of 2D Materials and Heterostructures
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