Work function reduction using 8-hydroxyquinolinolato-lithium for efficient inverted devices

Soohyung Park, Yeonjin Yi, Sangwan Cho, Hyunbok Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The work function reduction of various transparent conducting materials with 8-hydroxyquinolinolato-lithium (Liq) was investigated using in situ ultraviolet photoelectron spectroscopy (UPS) measurements. The work function of single-walled carbon nanotubes (SWCNTs), poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), and indium tin oxide (ITO), was significantly reduced by 1.00, 1.08 and 0.50 eV by depositing a 3.5 nm-thick Liq layer. This originates from the interface dipole having its negative pole pointed toward each electrode. These work function reductions would enhance electron injection or extraction in inverted organic electronic devices. However, the high electron injection barriers from electrodes to Liq itself were observed (2.43-2.53 eV), and thus an ultrathin Liq layer should be used for efficient electron injection through tunneling mechanism.

Original languageEnglish
Pages (from-to)102-105
Number of pages4
JournalChemical Physics Letters
Volume652
DOIs
Publication statusPublished - 2016 May 16

Fingerprint

Electron injection
Lithium
lithium
injection
Ultraviolet photoelectron spectroscopy
Electrodes
Styrene
electrons
electrodes
ultraviolet spectroscopy
Single-walled carbon nanotubes (SWCN)
sulfonates
indium oxides
tin oxides
Poles
polystyrene
poles
carbon nanotubes
photoelectron spectroscopy
dipoles

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

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abstract = "The work function reduction of various transparent conducting materials with 8-hydroxyquinolinolato-lithium (Liq) was investigated using in situ ultraviolet photoelectron spectroscopy (UPS) measurements. The work function of single-walled carbon nanotubes (SWCNTs), poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), and indium tin oxide (ITO), was significantly reduced by 1.00, 1.08 and 0.50 eV by depositing a 3.5 nm-thick Liq layer. This originates from the interface dipole having its negative pole pointed toward each electrode. These work function reductions would enhance electron injection or extraction in inverted organic electronic devices. However, the high electron injection barriers from electrodes to Liq itself were observed (2.43-2.53 eV), and thus an ultrathin Liq layer should be used for efficient electron injection through tunneling mechanism.",
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Work function reduction using 8-hydroxyquinolinolato-lithium for efficient inverted devices. / Park, Soohyung; Yi, Yeonjin; Cho, Sangwan; Lee, Hyunbok.

In: Chemical Physics Letters, Vol. 652, 16.05.2016, p. 102-105.

Research output: Contribution to journalArticle

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AB - The work function reduction of various transparent conducting materials with 8-hydroxyquinolinolato-lithium (Liq) was investigated using in situ ultraviolet photoelectron spectroscopy (UPS) measurements. The work function of single-walled carbon nanotubes (SWCNTs), poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), and indium tin oxide (ITO), was significantly reduced by 1.00, 1.08 and 0.50 eV by depositing a 3.5 nm-thick Liq layer. This originates from the interface dipole having its negative pole pointed toward each electrode. These work function reductions would enhance electron injection or extraction in inverted organic electronic devices. However, the high electron injection barriers from electrodes to Liq itself were observed (2.43-2.53 eV), and thus an ultrathin Liq layer should be used for efficient electron injection through tunneling mechanism.

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