Pb1－xMnxSe薄膜的光学特性

采用分子束外延的方法在BaF₂(111)衬底上制备出了高质量的Pb_1-xMn_xSe(0≤x≤0.0681)薄膜.X射线衍射结果表明，Pb₁-xMn_xSe薄膜为立方相NaCl型结构，没有观察到MnSe相分离现象，薄膜的取向为平行于衬底(111)晶面.晶格常数随着Mn含量的增加逐渐减小，Mn含量由Vegard公式得到.通 关键词： 1-xMn_xSe外延薄膜')" href="#">Pb_1-xMn_xSe外延薄膜 透射光谱 带隙 折射率

Optical properties of Pb1-xMnxSe thin films

High quality Pb_1-xMn_xSe(0≤x≤0.0681) thin films have been grown on BaF₂(111) substrates by molecular beam epitaxy. Optical and structural properties of the Pb_1-xMn_xSe films have been studied using transmission spectrum and high resolution Ｘ-ray diffraction(HRXRD).HRXRD paterns indicate that Pb_1-xMn_xSe films have cubic-phase structure,and MnSe phase separation is not observed. The film orientation is parallel to (111) surface ofsubstrate. The lattice constant of Pb_1-xMn_xSe films decreases with increasing Mn content. The Mn content can be obtained by using Vegard's formula. Sharp absorption edges were observed in the transmission spectrum of Pb_1-xMn_xSe films.The fundamantal band gap of the Pb_1-xMn_xSe films was obtained by simulation, which increases almost exponentially from 0.28eV at x=0 to 0.49eV at x=0.0681. The refractive index in the wavelength ranged from 4 to 9.5 μm has also been obtained.