Reduced leakage current in BiFeO3–BiCrO3 nanocomposite films formed by chemical solution deposition
Reduced leakage current in BiFeO3–BiCrO3 nanocomposite films formed by chemical solution deposition
复制标题
DOI：
10.1063/1.3467965
复制
发表时间：
2010-09
影响因子：
3.2
通讯作者：
S. Singh;S. Shanthy;H. Ishiwara
中科院分区：
文献类型：
--
作者：
S. Singh;S. Shanthy;H. Ishiwara
通过在Pt/Ti/SiO2/Si（100）结构上沉积溶胶-凝胶溶液形成BiFeO3-BiCrO3纳米复合膜。x射线衍射分析发现，在空气和O2气氛中550℃退火后的薄膜由BiFeO3 （BFO）和BiCrO3 （BCO）的多晶复合材料组成，薄膜中没有其他杂质相。在O2/空气中退火后，BFO-BCO复合薄膜中分别出现了直径约为120 nm和80 nm的小颗粒，这些纳米颗粒可以有效抑制薄膜中的泄漏电流。我们首次观察到，在600 kV/cm的电场下，BFO薄膜的泄漏电流在10−6 A/cm2范围内，比类似电场下的BFO薄膜低4个数量级以上。在空气/O2气氛中退火的BFO-BCO薄膜的低漏电流密度可能是由于低氧空位、欧姆导率占主导地位和晶界间损耗限制了导率。在一个应用程序下，剩余极化可达30 μC/cm2。
BiFeO3–BiCrO3 nanocomposite films were formed by depositing sol-gel solutions on Pt/Ti/SiO2/Si(100) structures. It was found from x-ray diffraction analysis that the films annealed at 550 °C in air and O2 atmosphere formed by polycrystalline composites of BiFeO3 (BFO) and BiCrO3 (BCO) without any other impurity phase in films. The BFO–BCO composite films annealed in O2/air showed small grains approximately 120 nm and 80 nm in diameter, respectively, and these nanograins were effective in suppressing leakage current in the films. We observed for the first time the leakage current in the range of 10−6 A/cm2 at an applied field 600 kV/cm, which is more than four order of magnitude lower than BFO films at similar applied electric field. The low leakage current density in BFO–BCO films annealed in air/O2 atmosphere might be due to the low oxygen vacancies, domination of the Ohmic conduction and intergrain depletion in grain boundary limited conduction. The remanent polarizations as large as 30 μC/cm2 at an app...