XPS and UPS study on band alignment at Pt-Zn-terminated ZnO(0001) interface
XPS and UPS study on band alignment at Pt-Zn-terminated ZnO(0001) interface
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DOI：
10.1016/j.apsusc.2011.08.095
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发表时间：
2011-11-01
影响因子：
6.7
通讯作者：
Nagata, Takahiro
中科院分区：
文献类型：
--
作者：
Blumentrit, Petr;Yoshitake, Michiko;Nagata, Takahiro
Pt和Zn-终止的ZnO（0 0 0 1）之间的界面进行了研究，通过X射线和紫外光电子能谱，以检查电子能带排列。清洁的ZnO（0 0 0 1）表面的角分辨X射线光电子能谱测量显示了向下的能带弯曲0.25 eV。价带谱分析结果表明，清洁ZnO（0 0 0 1）的功函数和价带顶分别为4.49eV和2.79eV。铂，然后沉积在几个沉积步骤到一个干净的ZnO（0 0 0 1）表面上的厚度高达0.6 nm。沉积后，Zn 2 p双峰的结合能向低值移动了0.77 eV，测得的功函数变为5.51 eV。结果表明，Pt/ZnO（0 0 0 1）界面的肖特基势垒高度为1.11eV。(C)2011 Elsevier B. V.保留所有权利。
The interface between Pt and Zn-terminated ZnO(0 0 0 1) was investigated by X-ray and ultra violet photoelectron spectroscopy in order to examine electronic band alignment. An angle-resolved X-ray photoelectron spectroscopy measurement of the clean ZnO(0 0 0 1) surface has revealed a downward band bending by 0.25 eV. The results of the valence band analysis show that the work function and the valence band maximum of clean ZnO(0 0 0 1) were 4.49 eV and 2.79 eV, respectively. Platinum was then deposited in several deposition steps onto a clean ZnO(0 0 0 1) surface up to 0.6 nm in thickness. After the deposition, the binding energy of Zn 2p doublet peak was shifted towards lower value by 0.77 eV, and the measured work function changed to 5.51 eV. As a result, the Schottky barrier height of Pt/ZnO(0 0 0 1) interface was 1.11 eV. (C) 2011 Elsevier B.V. All rights reserved.