Hard x-ray photoelectron spectroscopy as a probe of the intrinsic electronic properties of CdO
Hard x-ray photoelectron spectroscopy as a probe of the intrinsic electronic properties of CdO
复制标题
硬 X 射线光电子能谱作为 CdO 固有电子特性的探针
DOI：
10.1103/physrevb.89.035203
复制
发表时间：
2014
影响因子：
3.7
通讯作者：
Mudd J
中科院分区：
文献类型：
--
作者：
Mudd J
利用硬X射线光电子能谱（HAXPES）研究了金属有机物气相外延（MOVPE）生长的单晶CdO（100）薄膜的本征电子性质。HAXPES技术降低的表面灵敏度放宽了严格的表面制备要求，从而允许测量具有固有较高载流子浓度的生长样品（）。给出了在6054 eV光子能量下测量的价带和芯能级的高分辨率HAXPES谱。导带填充和带隙重整化的影响进行了讨论，以解释所观察到的结合能移动。部分占据的导带特征的测量带宽指示等离子体激元贡献可以在较高载流子浓度下存在。的Cd 3和O 1核心水平线的形状被发现表现出增加的不对称性与载流子浓度的增加，解释为最终状态屏蔽效应从导带中的载流子的证据。或者，核心水平的线的形状被解释为产生强传导电子等离子体卫星。这两个竞争模型的性质来描述金属氧化物的核心水平线的形状进行了探讨。
Hard x-ray photoelectron spectroscopy (HAXPES) is used to investigate the intrinsic electronic properties of single crystal epitaxial CdO(100) thin films grown by metal organic vapor phase epitaxy (MOVPE). The reduced surface sensitivity of the HAXPES technique relaxes stringent surface preparation requirements, thereby allowing the measurement of as-grown samples with intrinsically higher carrier concentration (). High-resolution HAXPES spectra of the valence band and core levels measured at photon energy of 6054 eV are presented. The effects of conduction band filling and band gap renormalization are discussed to explain the observed binding energy shifts. The measured bandwidth of the partially occupied conduction band feature indicates that a plasmon contribution may be present at higher carrier concentrations. The Cd 3and O 1core-level line shapes are found to exhibit an increased asymmetry with increased carrier concentration, interpreted as evidence for final state screening effects from the carriers in the conduction band. Alternatively the core-level line shape is interpreted as arising from strong conduction electron plasmon satellites. The nature of these two competing models to describe core-level line shapes in metallic oxides is explored.
劳伦斯利弗莫尔实验室
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
Lawrence Livermore Laboratory
通讯作者：
Lawrence Livermore Laboratory