Graphene-enhanced intermolecular interaction at interface between copper- and cobalt-phthalocyanines

Wei-Dong Dou; Shu-Ping Huang; Chun-Sing Lee

doi:10.1063/1.4932192

Author(s)

Wei-Dong Dou
Shu-Ping Huang
Chun-Sing Lee

Related Research Unit(s)

Centre of Super-Diamond and Advanced Films

Detail(s)

Original language	English
Article number	134706
Journal / Publication	Journal of Chemical Physics
Volume	143
Issue number	13
Publication status	Published - 7 Oct 2015

Link(s)

DOI	DOI https://doi.org/10.1063/1.4932192 Final Published version
	Check@CityULib
Attachment(s)	Documents 6977386.pdf Final Published version, 6.83 MB, PDF Publisher's Copyright Statement COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Wei-Dong Dou, Shu-Ping Huang, and Chun-Sing Lee , "Graphene-enhanced intermolecular interaction at interface between copper- and cobalt-phthalocyanines", J. Chem. Phys. 143, 134706 (2015) and may be found at https://doi.org/10.1063/1.4932192.
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-84943805061&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(af9a3565-0d65-4c9d-800d-ddb0fd8277ad).html

Abstract

Interfacial electronic structures of copper-phthalocyanine (CuPc), cobalt-phthalocyanine (CoPc), and graphene were investigated experimentally by using photoelectron spectroscopy. While the CuPc/graphene interface shows flat band structure and negligible interfacial dipole indicating quite weak molecule-substrate interaction, the CuPc/CoPc/graphene interface shows a large interfacial dipole and obvious energy level bending. Controlled experiments ruled out possible influences from the change in film structure of CuPc and pure π-π interaction between CoPc and CuPc. Analysis based on X-ray photoelectron spectroscopy and density functional theory reveals that the decrease in the work function for the CuPc/CoPc/graphene system is induced by the intermolecular interaction between CuPc and CoPc which is enhanced owning to the peculiar electronic properties at the CoPc-graphene interface.