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Title: Surface-Induced Orientation Control of CuPc Molecules for the Epitaxial Growth of Highly Ordered Organic Crystals on Graphene

Abstract

The epitaxial growth and preferred molecular orientation of copper phthalocyanine (CuPc) molecules on graphene has been systematically investigated and compared with growth on Si substrates, demonstrating the role of surface-mediated interactions in determining molecular orientation. X-ray scattering and diffraction, scanning tunneling microscopy, scanning electron microscopy, and first-principles theoretical calculations were used to show that the nucleation, orientation and packing of CuPc molecules on films of graphene are fundamentally different compared to those grown on Si substrates. Interfacial dipole interactions induced by charge transfer between CuPc molecules and graphene are shown to epitaxially align the CuPc mole-cules in a face-on orientation in a series of ordered superstructures. At high temperatures, CuPc molecules lie flat with respect to the graphene substrate to form strip-like CuPc crystals with micron sizes containing monocrystalline grains. Such large epitaxial crystals may potentially enable bulk-like properties to improve the device properties in organic electronics, which charge transport, exciton diffusion and dissociation are currently limited by grain size effects and molecular orientation.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Center for Nanophase Materials Sciences
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1068091
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 135; Journal Issue: 9; Journal ID: ISSN 0002--7863
Country of Publication:
United States
Language:
English

Citation Formats

Xiao, Kai, Deng, Wan, Keum, Jong Kahk, Yoon, Mina, Vlassiouk, Ivan V, Clark, Kendal W, Li, An-Ping, Kravchenko, Ivan I, Gu, Gong, Payzant, E Andrew, Sumpter, Bobby, Smith, Sean C, Browning, Jim, and Geohegan, David B. Surface-Induced Orientation Control of CuPc Molecules for the Epitaxial Growth of Highly Ordered Organic Crystals on Graphene. United States: N. p., 2013. Web. doi:10.1021/ja3125096.
Xiao, Kai, Deng, Wan, Keum, Jong Kahk, Yoon, Mina, Vlassiouk, Ivan V, Clark, Kendal W, Li, An-Ping, Kravchenko, Ivan I, Gu, Gong, Payzant, E Andrew, Sumpter, Bobby, Smith, Sean C, Browning, Jim, & Geohegan, David B. Surface-Induced Orientation Control of CuPc Molecules for the Epitaxial Growth of Highly Ordered Organic Crystals on Graphene. United States. doi:10.1021/ja3125096.
Xiao, Kai, Deng, Wan, Keum, Jong Kahk, Yoon, Mina, Vlassiouk, Ivan V, Clark, Kendal W, Li, An-Ping, Kravchenko, Ivan I, Gu, Gong, Payzant, E Andrew, Sumpter, Bobby, Smith, Sean C, Browning, Jim, and Geohegan, David B. Tue . "Surface-Induced Orientation Control of CuPc Molecules for the Epitaxial Growth of Highly Ordered Organic Crystals on Graphene". United States. doi:10.1021/ja3125096.
@article{osti_1068091,
title = {Surface-Induced Orientation Control of CuPc Molecules for the Epitaxial Growth of Highly Ordered Organic Crystals on Graphene},
author = {Xiao, Kai and Deng, Wan and Keum, Jong Kahk and Yoon, Mina and Vlassiouk, Ivan V and Clark, Kendal W and Li, An-Ping and Kravchenko, Ivan I and Gu, Gong and Payzant, E Andrew and Sumpter, Bobby and Smith, Sean C and Browning, Jim and Geohegan, David B},
abstractNote = {The epitaxial growth and preferred molecular orientation of copper phthalocyanine (CuPc) molecules on graphene has been systematically investigated and compared with growth on Si substrates, demonstrating the role of surface-mediated interactions in determining molecular orientation. X-ray scattering and diffraction, scanning tunneling microscopy, scanning electron microscopy, and first-principles theoretical calculations were used to show that the nucleation, orientation and packing of CuPc molecules on films of graphene are fundamentally different compared to those grown on Si substrates. Interfacial dipole interactions induced by charge transfer between CuPc molecules and graphene are shown to epitaxially align the CuPc mole-cules in a face-on orientation in a series of ordered superstructures. At high temperatures, CuPc molecules lie flat with respect to the graphene substrate to form strip-like CuPc crystals with micron sizes containing monocrystalline grains. Such large epitaxial crystals may potentially enable bulk-like properties to improve the device properties in organic electronics, which charge transport, exciton diffusion and dissociation are currently limited by grain size effects and molecular orientation.},
doi = {10.1021/ja3125096},
journal = {Journal of the American Chemical Society},
issn = {0002--7863},
number = 9,
volume = 135,
place = {United States},
year = {2013},
month = {1}
}