Manipulation of work function and surface free energy of tungsten oxide hole injection layer modified with a self-assembled monolayer

Seong Ho Kim, Hanae Otsuka, Hyea Weon Shin, Kuniaki Tanaka, Rigoberto C. Advincula, Hiroaki Usui

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

As a hole injection layer for organic devices, a tungsten oxide (WO x ) thin film was vapor-deposited on an indium tin oxide (ITO) substrate, on which a self-assembled monolayer (SAM) of either 3-aminopropyltrimethoxysilane (APS), phenyltrimethoxysilane (PTMS), or octadecyltrimethoxysilane (ODS) was prepared to modify the surface characteristics. The deposition of WOx substantially increased the ionization potential (Ip) of the substrate surface, which was effective in enhancing hole injection. The formation of SAM on WOx reduced Ip, but enabled the control of the surface free energy so as to modify the growth morphology of an organic film deposited on its surface. A hole-only device was prepared using a hole transport material of N,N0-diphenyl-N,N0-bis(3- methylphenyl)-(1,10-biphenyl)-4,40-diamine (TPD). In the space-charge-limited region, a high current was drawn by using an anode that has a high Ip. At low driving voltages, however, the current flow was considerably influenced by the surface free energy. It was found that the PTMS-SAM on WOx gives a satisfactory accommodation of both the work function and the surface energy.

Original languageEnglish
Article number01BB01
JournalJapanese Journal of Applied Physics
Volume50
Issue number1 PART 3
DOIs
Publication statusPublished - 2011 Jan
Externally publishedYes

Fingerprint

tungsten oxides
Self assembled monolayers
Free energy
Tungsten
manipulators
free energy
Ionization potential
injection
Oxides
ionization potentials
accommodation
Substrates
Temperature programmed desorption
diamines
Tin oxides
Electric space charge
Interfacial energy
indium oxides
Indium
low voltage

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Manipulation of work function and surface free energy of tungsten oxide hole injection layer modified with a self-assembled monolayer. / Kim, Seong Ho; Otsuka, Hanae; Shin, Hyea Weon; Tanaka, Kuniaki; Advincula, Rigoberto C.; Usui, Hiroaki.

In: Japanese Journal of Applied Physics, Vol. 50, No. 1 PART 3, 01BB01, 01.2011.

Research output: Contribution to journalArticle

Kim, Seong Ho ; Otsuka, Hanae ; Shin, Hyea Weon ; Tanaka, Kuniaki ; Advincula, Rigoberto C. ; Usui, Hiroaki. / Manipulation of work function and surface free energy of tungsten oxide hole injection layer modified with a self-assembled monolayer. In: Japanese Journal of Applied Physics. 2011 ; Vol. 50, No. 1 PART 3.
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