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首页> 外文期刊>Microelectronic Engineering >Dielectric enhancement in interface-modified BaTiO_3/SrTiO_3 multilayered films prepared by pulsed laser deposition
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Dielectric enhancement in interface-modified BaTiO_3/SrTiO_3 multilayered films prepared by pulsed laser deposition

机译:脉冲激光沉积制备界面改性BaTiO_3 / SrTiO_3多层膜的介电增强

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摘要

Pulsed-laser-deposited polycrystalline BaTiO_3/SrTiO_3 multilayered films on Pt/Ti/SiO_2/Si substrates have been fabricated with inter-facial modification through lowering the oxygen pressure during the time interval in between two adjacent depositions. It is found that the formation of the heterolayered structure is essential to get the dielectric enhancement. Such heterolayered films have large dielectric constant of 1201 with a loss tangent below 0.1 at 10 KHz. This is about two times that of the identically prepared Ba_(0.5)Sr_(0.5)TiO_3/ Ba_(0.5)Sr_(0.5)TiO_3 homolayered and uniform Ba_(0.5)Sr_(0.5)TiO_3 films. The enhancement of dielectric properties is attributed to the presence of the interfacial regions with controllable space charges due to the formation of oxygen vacancies at lower oxygen pressure.
机译:通过在两个相邻沉积之间的时间间隔内降低氧气压力,通过界面改性,在Pt / Ti / SiO_2 / Si衬底上制备了脉冲激光沉积的多晶BaTiO_3 / SrTiO_3多层膜。发现异质层结构的形成对于获得介电增强是必不可少的。这样的异层膜具有1201的大介电常数,在10KHz下的损耗角正切低于0.1。这是相同制备的Ba_(0.5)Sr_(0.5)TiO_3 / Ba_(0.5)Sr_(0.5)TiO_3均相且均匀的Ba_(0.5)Sr_(0.5)TiO_3膜的约两倍。介电性能的提高归因于由于在较低的氧气压力下形成了氧空位而导致具有可控空间电荷的界面区域的存在。

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