journal article·2018-03-21

Giant Photoresponse in Quantized SrRuO3 Monolayer at Oxide Interfaces

Heng-Jui Liu, Jing-Ching Wang, Deok-Yong Cho, Kang-Ting Ho, Jheng-Cyuan Lin, Bo-Chao Huang, Yue-Wen Fang, Yuan-Min Zhu, Qian Zhan, Lin Xie, Xiao-Qing Pan, Ya-Ping Chiu, Chun-Gang Duan, Jr-Hau He, Ying-Hao Chu

ACS Photonics· Volume 5· Issue 3
Publisher page

Abstract

The photoelectric effect in semiconductors is the main mechanism for most modern optoelectronic devices, in which the adequate bandgap plays the key role for acquiring high photoresponse. Among numerous material categories applied in this field, the complex oxides exhibit great possibilities because they present a wide distribution of band gaps for absorbing light with any wavelength. Their physical properties and lattice structures are always strongly coupled and sensitive to light illumination. Moreover, the confinement of dimensionality of the complex oxides in the heterostructures can provide more diversities in designing and modulating the band structures. On the basis of this perspective, we have chosen itinerary ferromagnetic SrRuO3 as the model material, and fabricated it in one-unit-cell thickness in order to open a small band gap for effective utilization of visible light. By inserting this SrRuO3 monolayer at the interface of the well-developed two-dimensional electron gas system (LaAlO3/SrTiO3), the resistance of the monolayer can be further revealed. In addition, a giant enhancement (>300%) of photoresponse under illumination of visible light with power density of 500 mW/cm2 is also observed. Such can be ascribed to the further modulation of band structure of the SrRuO3 monolayer under the illumination, confirmed by cross-section scanning tunneling microscopy (XSTM). Therefore, this study demonstrates a simple route to design and explore the potential low dimensional oxide materials for future optoelectronic devices.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Advanced Condensed Matter Physics · Magnetic and transport properties of perovskites and related materials

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

Affiliations

Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan

Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan

IPIT and Department of Physics, Chonbuk National University, Jeonju 54896, Republic of Korea

Computer, Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia

Institute of Physics, Academia Sinica, Taipei 11529, Taiwan

Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China

Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan

Department of Material Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China

National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

National Laboratory of Solid State Microstructures and College of Engineering and Applied Sciences, Nanjing University, Nanjing, Jiangsu 210093, China

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

Department of Physics and Astronomy, University of California-Irvine, Irvine, California 92697, United States

Department of Physics, National Taiwan University, Taipei 10617, Taiwan

Department of Materials Science and Engineering, National Chiao Tung University Hsinchu 30010, Taiwan

Funding

Ministry of Science, ICT and Future Planning · Ministry of Science and Technology, Taiwan

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