Photoemission study of YBa2Cu3Oy thin films under light illumination

D. Asakura; J. W. Quilty; K. Takubo; S. Hirata; T. Mizokawa; Y. Muraoka; Z. Hiroi

doi:10.1016/j.elspec.2005.01.134

Photoemission study of YBa₂Cu₃O_y thin films under light illumination

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

Research output: Contribution to journal › Article › peer-review

Abstract

The photocarrier injection (PCI) effect is observed at the heterojunction of YBa₂Cu_3Oy (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 language	English
Pages (from-to)	499-502
Number of pages	4
Journal	Journal of Electron Spectroscopy and Related Phenomena
Volume	144-147
DOIs	https://doi.org/10.1016/j.elspec.2005.01.134
Publication status	Published - Jun 2005
Externally published	Yes

Keywords

Heterojunction
High-T thin films
Photocarrier injection

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Radiation
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Spectroscopy
Physical and Theoretical Chemistry

Access to Document

10.1016/j.elspec.2005.01.134

Cite this

@article{950526f030344ab9a861ec1f764dd391,

title = "Photoemission study of YBa2Cu3Oy thin films under light illumination",

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.",

keywords = "Heterojunction, High-T thin films, Photocarrier injection",

author = "D. Asakura and Quilty, {J. W.} and K. Takubo and S. Hirata and T. Mizokawa and Y. Muraoka and Z. Hiroi",

note = "Funding Information: This work was supported by a Grant-in-Aid for Scientific Research in the priority area “Novel Quantum Phenomena in Transition-Metal Oxides” from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.",

year = "2005",

month = jun,

doi = "10.1016/j.elspec.2005.01.134",

language = "English",

volume = "144-147",

pages = "499--502",

journal = "Journal of Electron Spectroscopy and Related Phenomena",

issn = "0368-2048",

publisher = "Elsevier",

}

TY - JOUR

T1 - Photoemission study of YBa2Cu3Oy thin films under light illumination

AU - Asakura, D.

AU - Quilty, J. W.

AU - Takubo, K.

AU - Hirata, S.

AU - Mizokawa, T.

AU - Muraoka, Y.

AU - Hiroi, Z.

N1 - Funding Information: This work was supported by a Grant-in-Aid for Scientific Research in the priority area “Novel Quantum Phenomena in Transition-Metal Oxides” from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.

PY - 2005/6

Y1 - 2005/6

N2 - 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.

AB - 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.

KW - Heterojunction

KW - High-T thin films

KW - Photocarrier injection

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U2 - 10.1016/j.elspec.2005.01.134

DO - 10.1016/j.elspec.2005.01.134

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VL - 144-147

SP - 499

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JO - Journal of Electron Spectroscopy and Related Phenomena

JF - Journal of Electron Spectroscopy and Related Phenomena

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