Electronic structures of 8-hydroquinolatolithium on Au substrate: The organic electron injection layer having semiconducting properties

Kwanghee Cho, Sang Wan Cho, Pyung Eun Jeon, Hyunbok Lee, Chung Nam Whang, Kwangho Jeong, Seong Jun Kang, Yeonjin Yi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We studied the electronic structures of the 8-hydroquinolatolithium (Liq)/Au interface using ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS) and theoretical calculation. It is revealed that Liq is an organic semiconducting material with electron and hole injection barriers of 1.28 and 1.32 eV in contact with Au, respectively. The theoretical calculations showed that the highest (lowest) occupied (unoccupied) molecular orbital [HOMO (LUMO)] of Liq mainly derive from the quinolate part of the molecule. The HOMO and LUMO levels are highly delocalized throughout the quinolate part, giving it good conducting properties unlike other insulating electron injection layers. Furthermore, the electronic structures of Liq are nearly identical to tris-(8-hydroquinoline) aluminum (Alq3), so that the energy level mismatching between the two molecules could be minimal. This explains why the Alq3 based device in combination with Liq shows good performance.

Original languageEnglish
Pages (from-to)984-987
Number of pages4
JournalSynthetic Metals
Volume158
Issue number21-24
DOIs
Publication statusPublished - 2008 Dec 1

Fingerprint

Electron injection
Electronic structure
photoelectron spectroscopy
Ultraviolet photoelectron spectroscopy
injection
electronic structure
Molecules
ultraviolet spectroscopy
Molecular orbitals
Substrates
Aluminum
Electron energy levels
molecules
molecular orbitals
electrons
X ray photoelectron spectroscopy
energy levels
aluminum
conduction
Electrons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Cho, Kwanghee ; Cho, Sang Wan ; Jeon, Pyung Eun ; Lee, Hyunbok ; Whang, Chung Nam ; Jeong, Kwangho ; Kang, Seong Jun ; Yi, Yeonjin. / Electronic structures of 8-hydroquinolatolithium on Au substrate : The organic electron injection layer having semiconducting properties. In: Synthetic Metals. 2008 ; Vol. 158, No. 21-24. pp. 984-987.
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Electronic structures of 8-hydroquinolatolithium on Au substrate : The organic electron injection layer having semiconducting properties. / Cho, Kwanghee; Cho, Sang Wan; Jeon, Pyung Eun; Lee, Hyunbok; Whang, Chung Nam; Jeong, Kwangho; Kang, Seong Jun; Yi, Yeonjin.

In: Synthetic Metals, Vol. 158, No. 21-24, 01.12.2008, p. 984-987.

Research output: Contribution to journalArticle

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AU - Cho, Kwanghee

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AU - Jeon, Pyung Eun

AU - Lee, Hyunbok

AU - Whang, Chung Nam

AU - Jeong, Kwangho

AU - Kang, Seong Jun

AU - Yi, Yeonjin

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