journal article·2021-02-17

Rewritable High-Mobility Electrons in Oxide Heterostructure of Layered Perovskite/Perovskite

Xiaofeng Chen, Tingting Zhang, Yang Yu, Xiangbin Cai, Tianyi Gao, Tianwei Zhang, Haoying Sun, Chenyi Gu, Zhengbin Gu, Ye Zhu, Jian Zhou, Yuefeng Nie, Xiaoqing Pan

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Abstract

Perovskite oxide SrTiO3 can be electron-doped and exhibits high mobility by introducing oxygen vacancies or dopants such as Nb or La. A reversible after-growth tuning of high mobility carriers in SrTiO3 is highly desired for the applications in high-speed electronic devices. Here, we report the observation of tunable high-mobility electrons in layered perovskite/perovskite (Srn+1TinO3n+1/SrTiO3) heterostructure. By use of Srn+1TinO3n+1 as the oxygen diffusion barrier, the oxygen vacancy concentration near the interface can be reversibly engineered by high-temperature annealing or infrared laser heating. Because of the identical elemental compositions (Sr, Ti, and O) throughout the whole heterostructure, interfacial ionic intermixing is absent, giving rise to an extremely high mobility (exceeding 55000 cm2 V–1 s–1 at 2 K) in this type of oxide heterostructure. This layered perovskite/perovskite heterostructure provides a promising platform for reconfigurable high-speed electronic devices.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Ferroelectric and Piezoelectric Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

Department of Materials Science and Engineering, Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697, United States

Funding

National Natural Science Foundation of China · Hong Kong Polytechnic University · Fundamental Research Funds for the Central Universities · Research Grants Council of Hong Kong · National Key R&D Program of China

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