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Epitaxial Co doped BaSnO3 thin films with tunable optical bandgap on MgO substrate

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Abstract

Co doped BaSnO3 films [BaSn1 − xCoxO3(0 ≤ x ≤ 0.50), i.e., BSCO] have been grown on MgO single-crystal substrates via pulsed laser deposition. Effects of the Co-doping level on the crystallinity, the microstructure, and optical properties of the BSCO films are investigated. All the BSCO films are of high crystallinity and grown epitaxially on MgO substrates. The lattice parameter of the (200) plane drops linearly with the increase of the ‘x’ value. The Co doping is found to increase the film roughness and the grain size, and a RMS roughness of 8.33 nm and grain size up to 100 nm are observed in the film with x = 0.50. The low Co-doping level (x = 0.05, 0.1) has slight anti-reflection effects on the incident visible light, and the Co-doping level higher than 0.2 reduces the optical transmittance significantly. The optical bandgap shows a first-rising then falling trend with the increase of the Co content, and the lowest bandgap of 1.94 eV is realized in the BSCO film with x = 0.50.

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Acknowledgements

Thank to the financial support from National Key R&D Program of China (2016YFA0201103), National Natural Science Foundation of China (51572281), and Basic Research Foundation of Shanghai, China (15JC1403600).

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Authors and Affiliations

  1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, No. 1295 Dingxi Road, Shanghai, 200050, People’s Republic of China

    Dong-Sheng Gao, Xiang-Dong Gao, Yong-Qing Wu, Tong-Tong Zhang, Jing-Nan Yang & Xiao-Min Li

  2. Suzhou Research Center, Shanghai Institute of Ceramics, Chinese Academy of Science, No. 238, North Changchun Road, Taicang, 215499, Jiangsu, People’s Republic of China

    Xiang-Dong Gao

  3. University of Chinese Academy of Science, No. 19A Yuquan Road, Beijing, 100049, People’s Republic of China

    Dong-Sheng Gao, Tong-Tong Zhang & Jing-Nan Yang

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Gao, DS., Gao, XD., Wu, YQ. et al. Epitaxial Co doped BaSnO3 thin films with tunable optical bandgap on MgO substrate. Appl. Phys. A 125, 158 (2019). https://doi.org/10.1007/s00339-019-2466-3

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