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首页> 外文期刊>Journal of Materials Science. Materials in Electronics >A study of cadmium mercury telluride (CMT) thin film structures: some physical observations and characteristics
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A study of cadmium mercury telluride (CMT) thin film structures: some physical observations and characteristics

机译：碲化镉汞（CMT）薄膜结构的研究：一些物理观察和特征

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Polycrystalline thin film structures of the form Cd_(1-x)Hg_xTe (0 ≤ x ≤ 0.5) were obtained on ultrasonically cleaned glass substrates in an alkaline medium (pH ≈ 10 ± 0.2) at 80℃. The forerunner solutions were obtained from the equimolar solutions of CdCl_2, HgCl_2 and 0.33 M-refluxed Na_2TeSO_3. The preparation parameters such as temperature, pH, deposition time and speed of mechanical stirring were optimized. The as-prepared samples were tightly adherent to the substrate support, less smooth, diffusely reflecting and were analysed for composition. It appeared that incorporation of Hg~(2+) in the lattice of CdTe replaced divalent Cd~(2+) predominantly. However, a small amount of Te~(2-) replacement by Hg~(2+) ions has also been observed at higher levels of Hg in CdTe ( > 0.1 mol. %). The samples were then characterized optically to determine the absorption coefficient, mode of optical transition and the optical bandgaps. The estimated band-gap decreased, typically from 1.51 to 0.83 eV as Hg content in CdTe was increased from 0 to 0.5. The dc electrical conductivity measurements were made in the temperature range from 300 to 550 K and it was observed that the conductivity increased rapidly up to x = 0.1 and thereafter remained more or less the same. The thermopower measurements showed n-type conduction of these films. Both carrier concentration (n) and mobility (μ) were computed from these studies and found to be dependent on the working temperature and the film composition. The surface morphologies of these as-grown layers were then observed via a scanning electron microscope. CdTe crystals are more or less crystalline spherical and hexagonal prismatic in shape whereas HgCdTe samples appear glassy and show hexagonal prismatic whiskers, some less frequent forms of needles.
机译：在80℃的碱性介质中，在超声清洗过的玻璃基板上，获得了Cd_（1-x）Hg_xTe形式的多晶薄膜结构（0≤x≤0.5）。前者溶液是从CdCl_2，HgCl_2和0.33 M回流的Na_2TeSO_3的等摩尔溶液中获得的。优化了制备参数，如温度，pH，沉积时间和机械搅拌速度。所制备的样品紧紧粘附在基底支撑物上，不那么光滑，漫反射并且分析了组成。在CdTe晶格中掺入Hg〜（2+）似乎主要取代了二价Cd〜（2+）。然而，在CdTe中Hg含量较高（> 0.1 mol。％）的情况下，也观察到少量的Hg〜（2+）离子替换Te〜（2-）。然后对样品进行光学表征，以确定吸收系数，光学跃迁模式和光学带隙。随着CdTe中Hg含量从0增加到0.5，估计的带隙减小，通常从1.51 eV减小到0.83 eV。直流电导率的测量是在300至550 K的温度范围内进行的，观察到电导率迅速上升至x = 0.1，此后几乎保持不变。热功率测量显示这些膜的n型传导。由这些研究计算出载流子浓度（n）和迁移率（μ），并发现它们取决于工作温度和膜组成。然后通过扫描电子显微镜观察这些生长的层的表面形态。 CdTe晶体或多或少是球形和六边形棱柱形晶体，而HgCdTe样品看起来呈玻璃状并显示六边形棱形晶须，一些不常见的针状形式。

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