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XPS measurements of air-exposed Cd(Zn)1xFexTe1ySey surfaces revisited
Vacuum ( IF 4 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.vacuum.2020.109340 M. Medić Ilić , N. Bundaleski , N. Ivanović , O.M.N.D. Teodoro , Z. Rakočević , D. Minić , N. Romčević , I. Radisavljević
Vacuum ( IF 4 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.vacuum.2020.109340 M. Medić Ilić , N. Bundaleski , N. Ivanović , O.M.N.D. Teodoro , Z. Rakočević , D. Minić , N. Romčević , I. Radisavljević
Abstract Recently introduced model for quantitative analysis of in-depth non-uniform surfaces is applied to reexamine the X-ray Photoelectron Spectroscopy (XPS) data of Cd0.99Fe0.01Te0.97Se0.03 and Zn0.98Fe0.02Te0.91Se0.09 crystalline samples. Special attention is paid to the precise identification of phases which form the bulk-like near-surface region and the surface overlayers (the oxide layer and the layer of organic impurities), as well as the influence of surface morphology on the measurements. The obtained results fully support earlier qualitative estimations, but also provide new quantitative insight into the composition of the three investigated regions. The near-surface region of Cd0.99Fe0.01Te0.97Se0.03 and Zn0.98Fe0.02Te0.91Se0.09 samples is slightly electropositive, with cation/anion ratio 52:48 and 53:47, respectively. Model surface structures, which are fully compatible with the experimental results, comprise 0.76 nm thick CdTeO3 layer at the surface of Cd0.99Fe0.01Te0.97Se0.03 and 0.33 nm thick mixed ZnO/TeO2 oxide layer on Zn0.98Fe0.02Te0.91Se0.09. In both samples the oxide layer is only a few atomic layers thick, implying that it suppresses further rapid migration of oxygen into the bulk.
中文翻译:
重新审视暴露在空气中的 Cd(Zn)1xFexTe1ySey 表面的 XPS 测量
摘要 应用最近引入的深度非均匀表面定量分析模型重新检查 Cd0.99Fe0.01Te0.97Se0.03 和 Zn0.98Fe0.02Te0.91Se0.09 晶体的 X 射线光电子能谱 (XPS) 数据样品。特别注意形成体状近表面区域和表面覆盖层(氧化层和有机杂质层)的相的精确识别,以及表面形态对测量的影响。获得的结果完全支持早期的定性估计,但也为三个研究区域的组成提供了新的定量见解。Cd0.99Fe0.01Te0.97Se0.03和Zn0.98Fe0.02Te0.91Se0.09样品的近表面区域略带正电,阳离子/阴离子比分别为52:48和53:47。模型表面结构与实验结果完全一致,包括 Cd0.99Fe0.01Te0.97Se0.03 表面 0.76 nm 厚的 CdTeO3 层和 Zn0.98Fe0.02Te0.91Se0 上 0.33 nm 厚的混合 ZnO/TeO2 氧化物层.09. 在这两个样品中,氧化物层只有几个原子层厚,这意味着它抑制了氧气进一步快速迁移到本体中。
更新日期:2020-06-01
中文翻译:
重新审视暴露在空气中的 Cd(Zn)1xFexTe1ySey 表面的 XPS 测量
摘要 应用最近引入的深度非均匀表面定量分析模型重新检查 Cd0.99Fe0.01Te0.97Se0.03 和 Zn0.98Fe0.02Te0.91Se0.09 晶体的 X 射线光电子能谱 (XPS) 数据样品。特别注意形成体状近表面区域和表面覆盖层(氧化层和有机杂质层)的相的精确识别,以及表面形态对测量的影响。获得的结果完全支持早期的定性估计,但也为三个研究区域的组成提供了新的定量见解。Cd0.99Fe0.01Te0.97Se0.03和Zn0.98Fe0.02Te0.91Se0.09样品的近表面区域略带正电,阳离子/阴离子比分别为52:48和53:47。模型表面结构与实验结果完全一致,包括 Cd0.99Fe0.01Te0.97Se0.03 表面 0.76 nm 厚的 CdTeO3 层和 Zn0.98Fe0.02Te0.91Se0 上 0.33 nm 厚的混合 ZnO/TeO2 氧化物层.09. 在这两个样品中,氧化物层只有几个原子层厚,这意味着它抑制了氧气进一步快速迁移到本体中。