等温近空间升华法生长Cd、$_x$、Zn、$_{1-x}$、Te梯度薄膜
Graded composition Cd$_x$Zn$_{1-x}$Te films grown by Isothermal Close Space Sublimation technique
摘要：
采用等温近空间升华法生长CdTe和ZnTe多层膜，制备了组分梯度的CdxZn 1-xTe薄膜。这两种层的厚度沿结构进行修改，以产生朝向膜表面的CdTe的平均浓度的增加。由于Zn/Cd在生长过程中的相互扩散，层的序列被转换成相对平滑的渐变组成膜。根据X射线衍射表征，虽然它们显示出相对高的镶嵌性，但这些层与（100）取向的GaAs衬底相干地生长。θ-2 θ图显示如从可变组成样品所预期的非常宽的衍射峰。光吸收中的带隙渐变效应也通过使用透明衬底的透射测量来验证。的薄膜的梯度组合物配置文件，证实了X-射线光电子和二次离子质谱。此外，定量Cd，Zn和Te的配置文件，通过分析卢瑟福背散射光谱的样品。该分析示出了范围从样品表面处的大约x = 0.8到与衬底的界面处的x = 0.35的CdTe摩尔分数分布。证明了使用简单且具有成本效益的程序生长梯度组合物层的可能性。这可能是有趣的技术应用，如CdS/CdTe太阳能电池中的可变成分的CdxZn 1-xTe层
英文摘要：
Graded composition CdxZn1-xTe films were prepared by growing several alternate layers of CdTe and ZnTe by the Isothermal Close Space Sublimation technique. The thickness of both kinds of layers was modified along the structure to produce an increase of the average concentration of CdTe towards the surface of the films. Due to Zn/Cd inter-diffusion during the growth process the sequence of layers was converted into a relatively smooth graded composition film. According to X- ray diffraction characterization the layers grew coherently with the (100) oriented GaAs substrates although they showed a relatively high mosaicity. Theta-2theta plots show very wide diffraction peaks as expected from variable composition samples. The band gap grading effect in light absorption was also verified through transmission measurements, using transparent substrates. Graded composition profiles of the thin films were confirmed by x-ray photoelectron and secondary ion mass spectroscopies. Moreover, quantitative Cd, Zn and Te profiles were obtained by the analysis of Rutherford backscattering spectra of the samples. This analysis showed a CdTe molar fraction profile ranging from approximately x = 0.8 at the surface of the sample and x = 0.35 at the interface with the substrate. The possibility of growing graded composition layers using a simple and cost-effective procedure was demonstrated. This could be interesting in technological applications like CdxZn1-xTe layers of variable composition in CdS/CdTe solar cells
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