Photoemission study of YBa2Cu3Oy thin films under light illumination
Photoemission study of YBa2Cu3Oy thin films under light illumination
复制标题
DOI：
10.1016/j.elspec.2005.01.134
复制
发表时间：
2004-12
影响因子：
1.9
通讯作者：
D. Asakura;J. Quilty;K. Takubo;S. Hirata;T. Mizokawa;Y. Muraoka;Z. Hiroi
中科院分区：
文献类型：
--
作者：
D. Asakura;J. Quilty;K. Takubo;S. Hirata;T. Mizokawa;Y. Muraoka;Z. Hiroi
掺Nb衬底和薄膜的异质结由于光生载流子注入而表现出光电导和光伏效应。光载流子注入有望取代化学取代成为强关联体系中载流子掺杂的新方法。我们已经研究了光载流子注入的性质：Nb使用X射线光电子能谱与脉冲激光激发。在30 Hz的脉冲激光照射下，芯能级谱向更高的结合能移动0.78 eV。能量偏移对应于在界面处产生的光电压。此外，我们还观察到能量移动强烈地依赖于激光的频率。通过分析频率依赖性，估计注入的光空穴的寿命为40 ms。
Heterojunctions of Nb-dopedsubstrate andthin films show photoconductivity and photovoltaic effects due to photocarrier injection. Photocarrier injection is expected to be a new carrier doping method in strongly correlated systems instead of chemical substitution. We have studied the nature of photocarrier injection in:Nb using x-ray photoemission spectroscopy with pulsed laser excitation. The core-level spectra shift to higher binding energy by 0.78 eV under pulsed laser illumination at 30 Hz. The energy shift corresponds to the photovoltage, which arises at the interface. In addition, we have observed that the energy shift strongly depends on the frequency of the laser. The lifetime of the injected photoholes has been estimated to be 40 ms by analyzing the frequency dependence.