...
首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Direct Observation of Surface-Mediated Electron-Hole Pair Recombination in TiO2(110)
【24h】

Direct Observation of Surface-Mediated Electron-Hole Pair Recombination in TiO2(110)

机译:TiO2(110)中表面介电电子-空穴对复合的直接观察

获取原文
获取原文并翻译 | 示例
           

摘要

The kinetics of surface and bulk electron-hole pair recombination have been measured separately on TiO2(110) in ultrahigh vacuum under well-controlled surface conditions for the first time. Using 100 eV incident electrons, excitation of electron-hole pairs occurs within ~6 A of the surface, and the rate of stimulated desorption of O2 was measured as a means of determining the charge carrier recombination kinetics, which are found to be mediated by the surface and to be first-order in charge carrier concentration. Comparison with a previous O2 photodesorption experiment, where excitation by 3.4 eV photons was used for electron-hole pair generation in a deeper region below the surface (~100 A), shows that bulk recombination in TiO2 occurs by second-order kinetics in charge carrier concentration.
机译:首次在良好控制的表面条件下,在超高真空下分别在TiO2(110)上测量了表面和体电子-空穴对重组的动力学。使用100 eV入射电子,在表面的〜6 A范围内发生电子-空穴对的激发,并测量了O2的受激解吸速率,作为确定电荷载流子复合动力学的一种手段,发现该现象是由电子介导的。表面和电荷载流子浓度是一阶的。与以前的O2光解吸实验进行比较,在O2光解吸实验中,通过3.4 eV光子的激发在表面以下的较深区域(约​​100 A)中生成电子-空穴对,结果表明TiO2中的整体重组是通过电荷载流子的二级动力学发生的浓度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号