【摘要】 采用分子束外延的方法在BaF2(111)衬底上制备出了高质量的Pb1-xMnxSe(0≤x≤0.0681)薄膜.X射线衍射结果表明,Pb1-xMnxSe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.通过理论模拟Pb1-xMnxSe薄膜的透射光谱,得到了Pb1-xMnxSe薄膜的带隙与Mn组分的关系,Pb1-xMnxSe薄膜的带隙宽度由0.28eV(x=0)按e指数形式增加到0.49eV(x=0.0681).同时还获得了Pb1-xMnxSe薄膜在波长为4—9.5μm间的折射率.更多还原

【Abstract】 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 of substrate.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 0.28?eV at x=0 to 0.49?eV at x=0.0681.The refractive index in the wavelength ranged from 4 to 9.5 μm has also been obtained.更多还原