Effect of substrate and intermediate layer on the conductivity and charge transport properties of epitaxial BaTiO3-delta films
Effect of substrate and intermediate layer on the conductivity and charge transport properties of epitaxial BaTiO3-delta films
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基底和中间层对外延 BaTiO3-δ 薄膜电导率和电荷传输性能的影响
DOI：
10.1088/1361-6463/aa98ad
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Liu J-M
中科院分区：
文献类型：
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作者：
Yang Cheng;Wei Weiyao;Gong Yanfen;Yan Longsen;Zhao Kai;Zhou Jian;Feng Jiajun;Zhang Aihua;Qin Minghui;Zeng Min;Fan Zhen;Gao Xingsen;Zhou Guofu;Lu Xubing;Liu J-M
BaTiO 3− δ的导电性和电荷输运行为通常由物理缺陷或化学金属离子掺杂来调节。在这项工作中，我们证明了外延BaTiO 3− δ薄膜的导电性和电荷传输特性可以通过使用不同的衬底和衬底与BaTiO 3− δ薄膜之间的中间层来极大地调节。电阻率随温度变化的实验表明，在SrTiO 3衬底上沉积的BaTiO 3− δ薄膜具有金属性。而在MgO和DyScO 3衬底上沉积的BaTiO 3− δ薄膜具有更高的电阻和半导体特性。此外，通过在BaTiO 3− δ薄膜中插入一层厚度为10 ~ 300 nm的SrTiO 3中间层，BaTiO 3− δ薄膜的电导率可以在很宽的范围内从半导体导电到金属导电进行调节。相反，在SrTiO 3衬底上沉积的BaTiO 3− δ薄膜，通过插入一层厚度在0 ~ 150 nm之间的中间层LaAlO 3薄膜，可以使其导电性从金属导电性大幅度降低到半导体导电性。BaTiO 3− δ薄膜的不同导电性和电荷输运行为与BaTiO 3− δ薄膜与衬底或中间层之间的氧空位交换/阻挡效应密切相关。
The conductivity and charge transport behaviors of BaTiO 3− δ are usually regulated by physical defect or chemical metal ion doping. In this work, we demonstrated that the conductivity and charge transport properties of epitaxial BaTiO 3− δ films can be greatly tuned by using different substrates and intermediate layers between the substrate and BaTiO 3− δ film. The temperature dependence of the resistivity experiments show that metallic behavior was observed in BaTiO 3− δ films deposited on SrTiO 3 substrate. While much higher resistance and semiconductor behavior were observed in BaTiO 3− δ films that deposited on MgO and DyScO 3 substrates. Additionally, the BaTiO 3− δ films' conductivity can be tuned over a wide range from semiconductor to metallic conduction through inserting one intermediate SrTiO 3 layer with thicknesses varying from 10 nm to 300 nm. Conversely, the conductivity of BaTiO 3− δ films deposited on SrTiO 3 substrates can be greatly reduced from metallic to semiconductor conduction through the insertion of one intermediate LaAlO 3 film with thickness varying from 0 nm to 150 nm. The different conductivity and charge transport behaviors of BaTiO 3− δ films are assumed to be closely related to the oxygen vacancy exchange/blocking effect between BaTiO 3− δ film and substrate or intermediate layer.