Quasi-ideal strontium titanate crystal surfaces through formation of strontium hydroxide
Quasi-ideal strontium titanate crystal surfaces through formation of strontium hydroxide
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DOI：
10.1063/1.122630
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发表时间：
1998-11-16
影响因子：
4
通讯作者：
Rogalla, H
中科院分区：
文献类型：
--
作者：
Koster, G;Kropman, BL;Rogalla, H
近年来，明确的、近乎完美的氧化钙钛矿单晶表面变得越来越重要。单端表面是可再生薄膜生长和基础生长研究的先决条件。在这项工作中，原子和横向力显微镜已经被用来显示SrTiO3的不同末端。我们观察到SrTiO3浸泡在水中后，SrO的最上层羟基化，这可以提高SrO在缓冲HF溶液中相对于TiO2的蚀刻选择性。无论抛光表面的初始状态和HF溶液的pH值如何，我们都可重复地获得完美的单端表面。这种方法可用于多种多组分氧化单晶。利用脉冲激光在这些表面上沉积，观察到了真正的二维反射高能电子衍射强度振荡。(C) 1998美国物理研究所。[s0003 - 6951(98) 03546 - 3]。
In recent years, well-defined and nearly perfect single crystal surfaces of oxide perovskites have become increasingly important. A single terminated surface is a prerequisite for reproducible thin film growth and fundamental growth studies. In this work, atomic and lateral force microscopy have been used to display different terminations of SrTiO3. We observe hydroxylation of the topmost SrO layer after immersion of SrTiO3 in water, which is used to enhance the etch-selectivity of SrO relative to TiO2 in a buffered HF solution. We reproducibly obtain perfect and single terminated surfaces, irrespective of the initial state of polished surfaces and the pH value of the HF solution. This approach to the problem might be used for a variety of multi-component oxide single crystals. True two-dimensional reflection high-energy electron diffraction intensity oscillations are observed during homo epitaxial growth using pulsed laser deposition on these surfaces. (C) 1998 American Institute of Physics. [S0003-6951(98)03546-3].