Surface and interface chemistry of bromine–methanol‐etched Cd0.9Zn0.1Te crystals

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
M. Ünal, M. Karaman, Gülçin Çelik, Okay Tüzel, Ö. Balbaşı, Ayşe Merve Genç, Raşit Turan
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引用次数: 0

Abstract

Chemical polishing or chemo‐mechanical polishing is crucial as a last step of surface preparation to remove the damaged layer and contaminants from the surface of CdZnTe crystals. The bromine–methanol solution is widely used for this purpose. However, bromine–methanol solution enriches the surface with Te and results in poor performance of CdZnTe crystals. In this study, the effect of the chemical polishing with 5% bromine–methanol solution on the surface and at the interface is investigated and it is demonstrated that etching duration strongly influences surface stoichiometry and interface contaminants. The evolution of the surface topography with etching and chemical changes are presented. It is shown that after 90 s etching/polishing, subsurface damage is removed and Te enrichment is minimum. Moreover, interface layer thickness is the smallest for 90 s etching duration. It is presented that further increase in the etching duration disturbs the surface stoichiometry and interface depth. It also calculated that 90 s of etching shows low interface barrier and symmetrical current–voltage curve.
溴甲醇蚀刻 Cd0.9Zn0.1Te 晶体的表面和界面化学性质
化学抛光或化学机械抛光是表面制备的最后一步,对于去除碲化镉晶体表面的损伤层和杂质至关重要。溴甲醇溶液被广泛用于此目的。然而,溴甲醇溶液会使表面富含 Te,导致 CdZnTe 晶体性能不佳。本研究调查了使用 5% 溴甲醇溶液进行化学抛光对表面和界面的影响,结果表明,蚀刻持续时间对表面化学计量和界面污染物有很大影响。研究还展示了表面形貌随蚀刻和化学变化而发生的演变。结果表明,经过 90 秒的蚀刻/抛光后,表面下的损伤被清除,Te 富集最小。此外,在 90 秒的蚀刻持续时间内,界面层厚度最小。蚀刻持续时间的进一步延长会扰乱表面化学计量和界面深度。计算还表明,90 秒的蚀刻时间显示出较低的界面势垒和对称的电流-电压曲线。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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