Photoemission study of YBa2Cu3Oy thin films under light illumination

D. Asakura, J. W. Quilty, K. Takubo, S. Hirata, T. Mizokawa, Yuji Muraoka, Z. Hiroi

Research output: Contribution to journalArticle

Abstract

The photocarrier injection (PCI) effect is observed at the heterojunction of YBa2Cu3Oy (YBCO) thin film and Nb-doped SrTiO 3 (STO:Nb) substrate. PCI is expected as a new carrier doping method in strongly correlated systems instead of chemical substitution. We have studied the nature of PCI in YBCO/STO:Nb using X-ray photoemission spectroscopy with pulsed laser excitation. In the core-level spectra, the energy shift to higher binding energy by 0.5 eV is observed under the laser illumination with frequency of 30 Hz. The energy shift corresponds to the photovoltage, which arises in the interface. In addition, we have measured the spectra varying frequency of the laser. The energy shift obviously depends on the frequency, which is related to the lifetime of the injected photoholes.

Original languageEnglish
Pages (from-to)499-502
Number of pages4
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume144-147
DOIs
Publication statusPublished - Jun 2005
Externally publishedYes

Fingerprint

Photoemission
photoelectric emission
Lighting
illumination
injection
Thin films
Laser excitation
Core levels
Lasers
shift
Photoelectron spectroscopy
thin films
X ray spectroscopy
Binding energy
Pulsed lasers
Heterojunctions
Substitution reactions
Doping (additives)
photovoltages
lasers

Keywords

  • Heterojunction
  • High-T thin films
  • Photocarrier injection

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

Photoemission study of YBa2Cu3Oy thin films under light illumination. / Asakura, D.; Quilty, J. W.; Takubo, K.; Hirata, S.; Mizokawa, T.; Muraoka, Yuji; Hiroi, Z.

In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 144-147, 06.2005, p. 499-502.

Research output: Contribution to journalArticle

Asakura, D. ; Quilty, J. W. ; Takubo, K. ; Hirata, S. ; Mizokawa, T. ; Muraoka, Yuji ; Hiroi, Z. / Photoemission study of YBa2Cu3Oy thin films under light illumination. In: Journal of Electron Spectroscopy and Related Phenomena. 2005 ; Vol. 144-147. pp. 499-502.
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AU - Muraoka, Yuji

AU - Hiroi, Z.

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