无机材料学报

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Pb1-xSrxSe薄膜材料的微结构和光学特性

王擎雷1, 吴惠桢1, 斯剑霄1, 徐天宁1, 夏明龙1, 谢正生2, 劳燕锋2
  

  1. (1. 浙江大学 物理系, 杭州 310027; 2. 中国科学院 上海微系统与信息技术研究所信息功能材料国家重点实验室, 上海 200050)
  • 收稿日期:2006-11-30 修回日期:2007-03-15 出版日期:2007-11-20 网络出版日期:2007-11-20

Microstructure and Optical Properties of Pb1-xSrxSe Thin Films

WANG Qing-Lei1, WU Hui-Zhen1, SI Jian-Xiao1, XU Tian-Ning1, XIA Ming-Long1, XIE Zheng-Sheng2, LAO Yan-Feng2   

  1. (1. Department of Physics, Zhejiang University, Hangzhou 310027, China; 2. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China)
  • Received:2006-11-30 Revised:2007-03-15 Published:2007-11-20 Online:2007-11-20

摘要:

采用分子束外延的方法在BaF2衬底(111)上制备出了高质量的Pb1-xSrxSe (0≤ x≤0.050)薄膜. X射线衍射结果表明, Pb1-xSrxSe 薄膜为立方相NaCl型晶体结构, 没有观察到SrSe相分离现象, 薄膜的取向为平行于衬底(111)晶面. 薄膜晶格常数随Sr含量的增加逐渐增大, Sr含量由Vegard公式得到. 再用理论模拟Pb1-xSrxSe 薄膜透射光谱的方法得到了相应的带隙. 最后通过介电函数模型拟合得到了PbSe和Pb1-xSrxSe 薄膜在光子能量位于基本带隙附近的折射率n和吸收系数α.

关键词: Pb1-xSrxSe 外延薄膜, 透射光谱, 折射率, 吸收系数

Abstract: High quality Pb1-xSrxSe (0≤ x≤0.050) thin films were grown on BaF2(111) substrates by using molecular beam epitaxy(MBE). Optical and structural properties of the Pb1-xSrxSe films were studied using transmission spectrum and high resolution X-ray diffraction (HRXRD). HRXRD patterns indicate that Pb1-xSrxSe films has cubic-phase structure, with no SrSe phase separation.
The films orientation is parallel to (111) surface of substrate. The lattice constants of the Pb1-xSrxSe films increase with increasing Sr content. The Sr content can be obtained by using Vegard formula. Sharp absorption edges are observed in the transmission spectrum of Pb1-xSrxSe films. The fundamental band gap of the Pb1-xSrxSe films is attained by simulation. Refractive indexes and absorption coefficients near the fundamental band-gap are obtained by simulation using dielectric function model(DFM).

Key words: Pb1-xSrxSe epitaxial films, transmission spectrum, refractive index, absorption coefficient

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