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镧掺杂BiGaO_3多晶薄膜光学性质

The optical properties of La doped BiGaO_3 polycrystalline films
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摘要 采用溶胶-凝胶技术在Pt/Ti/SiO_2/Si衬底上制备了不同镧掺杂浓度BiGaO_3(Lx BGO,0≤x≤0.1)薄膜.X-射线衍射(XRD)表明该属于正交晶系的多晶薄膜,原子力显微镜(AFM)图像显示样品表面具有很好的平整性.采用椭圆偏振技术对其光学性质进行了详细的研究,发现其光学常数符合Adachi色散模型.进一步发现其禁带宽度随着镧掺杂浓度的增加而增加,该规律与理论预言相吻合.有关LxBGO材料的研究为铋基光电器件如紫外探测器的实现提供物理基础支持. La doped BiGaO_3（LxBGO） films were fabricated by the Sol-Gel method on the Pt/Ti/SiO_2/Si substrates. Xray diffraction analysis shows that the films are polycrystalline with an orthorhombic structure. The atomic force microscopy images of the Lx BGO films suggest that the surface morphology is smooth. The optical properties of the samples were investigated by the spectroscopic ellipsometry in detail. The dielectric functions were extracted and in good agreement with the Adachi dispersion function. More one step,the optical band gap tends to increase with increasing La composition,which is consistent with the results of theoretical prediction. These results are helpful for the fabrication of Bibased opto-electrical devices such as ultraviolet detectors.
作者 张金中 诸佳俊 邓青林 余温雷 李亚巍 胡志高 孟祥建 褚君浩
机构地区 华东师范大学电子工程系极化材料与器件教育部重点实验室 中国科学院上海技术物理研究所红外物理国家重点实验室 温州医科大学信息与工程学院生物医学工程学系
出处 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2015年第4期447-451,共5页 Journal of Infrared and Millimeter Waves
基金 国家重点基础研究发展规划(2011CB922200 2013CB922300) 国家自然科学基金(11374097 61376129) 上海市科学技术委员会项目(13JC1402100 13JC1404200) 上海高校特聘教授(东方学者)项目~~
关键词 BiGaO3 椭圆偏振光谱 光学性质 光学常数 光学禁带宽度 BiGaO3 spectroscopic ellipsometry optical properties optical constants optical band gap
分类号 TN204 [电子电信—物理电子学]
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参考文献15

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红外与毫米波学报
2015年 第4期

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