Impacts of Molecular Orientation on the Hole Injection Barrier Reduction

CuPc/HAT-CN/Graphene

Junkyeong Jeong, Soohyung Park, Seong Jun Kang, Hyunbok Lee, Yeonjin Yi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The molecular orientation affected by the interaction between a substrate and deposited molecules plays an important role in device performance. It is known that the molecular orientation influences not only the charge transport property but also its electronic structure. Therefore, the combined study of morphology and electronic structure is of high importance for device application. As a transparent electrode, graphene has many promising advantages. However, graphene itself does not have an adequate work function for either an anode or a cathode, and thus the insertion of a charge injection layer is necessary for it to be used as an electrode. In this study, the hole injection barrier (HIB) reduction was investigated at the interface of copper phthalocyanine (CuPc)/graphene with the insertion of a hexaazatriphenylene hexacarbonitrile (HAT-CN) layer between them. The insertion of the HAT-CN layer roughens the originally flat graphene surface and it weakens the π-interaction between CuPc and of graphene. This induces face-on and edge-on mixed orientations of CuPc, while CuPc on bare graphene shows merely a face-on orientation. As a result, the HIB is reduced by the contribution of edge-on CuPc having lower ionization energy (0.37 eV) along with the high work function of the HAT-CN layer (0.26 eV).

Original languageEnglish
Pages (from-to)2292-2298
Number of pages7
JournalJournal of Physical Chemistry C
Volume120
Issue number4
DOIs
Publication statusPublished - 2016 Feb 4

Fingerprint

Graphite
Molecular orientation
Graphene
graphene
injection
insertion
Electronic structure
electronic structure
Electron transport properties
Charge injection
Electrodes
electrodes
Ionization potential
Charge transfer
Anodes
Cathodes
anodes
transport properties
cathodes
interactions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Jeong, Junkyeong ; Park, Soohyung ; Kang, Seong Jun ; Lee, Hyunbok ; Yi, Yeonjin. / Impacts of Molecular Orientation on the Hole Injection Barrier Reduction : CuPc/HAT-CN/Graphene. In: Journal of Physical Chemistry C. 2016 ; Vol. 120, No. 4. pp. 2292-2298.
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Impacts of Molecular Orientation on the Hole Injection Barrier Reduction : CuPc/HAT-CN/Graphene. / Jeong, Junkyeong; Park, Soohyung; Kang, Seong Jun; Lee, Hyunbok; Yi, Yeonjin.

In: Journal of Physical Chemistry C, Vol. 120, No. 4, 04.02.2016, p. 2292-2298.

Research output: Contribution to journalArticle

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