标题: Giant Photoresponse in Quantized SrRuO3 Monolayer at Oxide Interfaces
作者: Liu, Heng-Jui
Wang, Jing-Ching
Cho, Deok-Yong
Ho, Kang-Ting
Lin, Jheng-Cyuan
Huan, Bo-Chao
Fang, Yue-Wen
Zhu, Yuan-Min
Zhan, Qian
Xie, Lin
Pan, Xiao-Qing
Chiu, Ya-Ping
Duan, Chun-Gang
He, Jr-Hau
Chu, Ying-Hao
材料科学与工程学系
Department of Materials Science and Engineering
关键字: SrRuO3 monolayer;complex oxide heterostructures;photoresponse;optoelectronics;interface engineering
公开日期: 1-三月-2018
摘要: 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/cm(2) 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.
URI: http://dx.doi.org/10.1021/acsphotonics.7b01339
http://hdl.handle.net/11536/144733
ISSN: 2330-4022
DOI: 10.1021/acsphotonics.7b01339
期刊: ACS PHOTONICS
Volume: 5
起始页: 1041
结束页: 1049
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