Charge Transfer to LaAlO3/SrTiO3 Interfaces Controlled by Surface Water Adsorption and Proton Hopping

Adhikari Sanjay; Garcia-Castro Andres C.; Romero Aldo H.; Lee Hyungwoo; Lee Jung-Woo; Ryu Sangwoo; Eom Chang-Beom; Cen Cheng

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Charge Transfer to LaAlO3/SrTiO3 Interfaces Controlled by Surface Water Adsorption and Proton Hopping

机译：电荷转移至受表面水吸附和质子跳跃控制的LaAlO3 / SrTiO3界面

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Electronic properties of low dimensional systems are particularly sensitive to surface adsorbates. Clear understanding of such phenomena can lead to highly effective and nondestructive material engineering techniques. In this work, water adsorption at the surface of LaAlO3/SrTiO3 heterostructures is systematically studied. The saturation of surface dangling bonds by spontaneous water chemisorptions is found to be a main enabler of the formation of the interface 2D electron gas. In particular, when imbalanced distributions of water based ions, namely protons and hydroxyls, are generated, interface electron doping or depletion becomes surface adsorbates dominant and independent of the LaAlO3 layer thickness. The investigations also reveal the importance of hydrogen bonding through molecular water layers, which provides an energetically feasible pathway for manipulating the surface-bond protons and thus the interface electrical characteristics.

机译：低维系统的电子性质对表面吸附物特别敏感。对此类现象的清晰理解可以导致高效且无损的材料工程技术。在这项工作中，系统地研究了LaAlO3 / SrTiO3异质结构表面的水吸附。发现自发水化学吸附引起的表面悬空键的饱和是界面2D电子气形成的主要推动力。特别地，当产生水基离子即质子和羟基的不平衡分布时，界面电子的掺杂或耗尽成为表面吸附物占主导地位，并且与LaAlO3层厚度无关。研究还揭示了通过分子水层进行氢键键合的重要性，这为操纵表面键合质子以及界面电学特性提供了一条在能量上可行的途径。

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《Advanced Functional Materials》 |2016年第30期|5453-5459|共7页
作者
Adhikari Sanjay; Garcia-Castro Andres C.; Romero Aldo H.; Lee Hyungwoo; Lee Jung-Woo; Ryu Sangwoo; Eom Chang-Beom; Cen Cheng;
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West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA;

Univ Liege, Phys Theor Mat, B-4000 Sart Tilman Par Liege, Belgium|IPN, Ctr Invest & Estudios Avanzados, MX-76230 Queretaro, Mexico;

West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA;

Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA;

Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA;

Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA;

Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA;

West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA;

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1. Infrared ellipsometry study of photogenerated charge carriers at the (001) and (110) surfaces of SrTiO3 crystals and at the interface of the corresponding LaAlO3/SrTiO3 heterostructures [J] . Yazdi-Rizi M., Marsik P., Mallett B. P. P., Physical review, B . 2017,第19期

机译：红外椭圆形测定的光生电载流子在（001）和（110）的SrtiO3晶体表面和相应的Laal3 / srtio3异质结构的界面处
2. Molecular Dynamics Simulations of Quartz (101)-Water and Corundum (001)-Water Interfaces: Effect of Surface Charge and Ions on Cation Adsorption, Water Orientation, and Surface Charge Reversal [J] . Quezada Gonzalo R., Rozas Roberto E., Toledo Pedro G. The journal of physical chemistry, C. Nanomaterials and interfaces . 2017,第45期

机译：石英（101） - 水和刚玉（001） - 水界面的分子动力学模拟：表面电荷和离子对阳离子吸附，水取向和表面电荷反转的影响
3. 1-pK and 2-pK Protonation Models in the Theoretical Description of Simple Ion Adsorption at the Oxide/Electrolyte Interface: A Comparative Study of the Behavior of the Surface Charge, the Individual Isotherms of Ions, and the Accompanying Electrokine [J] . Wojciech Piasecki, Wladyslaw Rudzinski, Robert Charmas The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical . 2001,第40期

机译：在氧化物/电解质界面上简单离子吸附的理论描述中的1-pK和2-pK质子化模型：表面电荷，各个离子的等温线和伴随的电子因子行为的比较研究
4. Germanium Adsorption on SrTiO3 (001)2×1 surface: A Density Functional Theory Study [C] . Junjie Wang, sabelle Lefebvre International conference on advanced materials research . 2012

机译：SrTiO3（001）2×1表面上锗的吸附：密度泛函理论研究
5. Interplay between Superconductivity and Ferromagnetism at the LaAlO3/SrTiO3 Interface. [D] . Mehta, Manan. 2015

机译：LaAlO3 / SrTiO3界面上的超导性和铁磁性之间的相互作用。
6. Water at hydrophobic interfaces delays proton surface-to-bulk transfer and provides a pathway for lateral proton diffusion [O] . Chao Zhang, Denis G. Knyazev, Yana A. Vereshaga, 2012

机译：疏水界面处的水延缓了质子从表面到本体的转移并提供了质子横向扩散的途径
7. Infrared ellipsometry study of photogenerated charge carriers at the (001) and (110) surfaces of SrTiO3 crystals and at the interface of the corresponding LaAlO3/SrTiO3 heterostructures [O] . Yazdi-Rizi, M., Marsik, P., Mallett, B. P. P., 2017

机译：SrTiO3晶体的（001）和（110）表面以及相应的LaAlO3 / SrTiO3异质结构的界面处的光生载流子的红外椭圆偏振分析

Charge Transfer to LaAlO3/SrTiO3 Interfaces Controlled by Surface Water Adsorption and Proton Hopping

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