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
M3 - Article
AN - SCOPUS:17544370975
SN - 0368-2048
VL - 144-147
SP - 499
EP - 502
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
ER -