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BISMUTH TITANATE THIN FILMS GROWN BY HALIDE CHEMICAL VAPOR DEPOSITION

机译:卤化物化学气相沉积生长的钛酸铋薄膜

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BiI_3, TiI_4 and oxygen were used as precursors in a newly developed halide chemical vapor deposition process. With this process we were able to grow highly c-axis oriented Bi_4Ti_3O_(12) films onto Pt-coated silicon substrates. The total gas pressure was found to be a critical processing parameter to grow films with good crystallinity. It was found that the films grown at the highest total pressure and with the corresponding lowest total gas flow velocity had the most pronounced c-axis orientation. However, these films also contained a large number of pinholes and electrical characterization for these films were thus not possible. In contrast electrical characterization was possible for films fabricated at lower total gas pressures. For a 300 nm thick Bi_4Ti_3O_(12) film a dielectric constant around 200 and loss tan δ ~ 0.018 at 100 kHz were measured.
机译:在新开发的卤化物化学气相沉积过程中使用BII_3,TII_4和氧作为前体。通过该过程,我们能够将高度C轴取向的BI_4TI_3O_(12)薄膜生长到PT涂覆的硅基板上。发现总气体压力是一种临界加工参数,以生长具有良好结晶度的薄膜。发现,在最高总压力和相应的最低总气流速度下生长的薄膜具有最明显的C轴取向。然而,这些薄膜还包含大量针孔,因此不可能对这些薄膜的电学表征。在对比度的情况下,在较低的总气体压力下制造的薄膜可能是可能的。对于300nm厚的Bi_4Ti_3O_(12)膜,测量介电常数和100kHz的损耗TANδ〜0.018。

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