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Macro- and Microsegregation of Zn in Bridgman-grown CdZnTe

机译：布里奇曼生长的CdZnTe中Zn的宏观和微观偏析

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摘要

One of the remaining problems in the use of CdZnTe material as substrates in liquid phase epitaxy (LPE) of Cd_xHg_(1-x)Te (CMT) layers is that of variation in lattice matching, i.e. Zn content, across substrates. This will become increasingly important in the future as larger focal plane arrays of infrared detectors are required. The basic Bridgman growth process for CdTe/Cd_(0.96)Zn_(0.04)Te has been extended by applying the accelerated crucible rotation technique (ACRT). A marked reduction in axial Zn segregation is seen in 50 mm diameter ACRT material, but this effect is smaller in the case of 75 mm diameter crystals. Radial variations in Zn content are small in both sizes of crystal, demonstrating the benefits obtained from ACRT stirring. Both macro- and microsegregation effects have been studied in these crystals in an attempt to understand the growth mechanism. Zinc distributions have been assessed by near-infrared transmission, X-ray lattice parameter measurements, atomic absorption spectrometry (AAS) and Auger electron spectrometry (AES). The last technique was used for the microsegregation studies, while AAS provides the absolute calibration for Zn content. Comparisons with segregation behaviour found in the literature will be given. It will be shown that the low temperature gradient and low growth rate lead to a degree of supercooling in the first-to-freeze region and this leads to significant Zn segregation in both radial and axial directions. As the crystals reach full diameter, the radial variation is decreased, presumably by the action of the ACRT, and axial segregation is also reduced.
机译：在Cd_xHg_（1-x）Te（CMT）层的液相外延（LPE）中，使用CdZnTe材料作为衬底的剩余问题之一是整个衬底的晶格匹配变化，即Zn含量。随着需要更大的红外探测器焦平面阵列，这在未来将变得越来越重要。通过应用加速坩埚旋转技术（ACRT）扩展了CdTe / Cd_（0.96）Zn_（0.04）Te的基本Bridgman生长过程。在直径为50 mm的ACRT材料中，轴向Zn偏析显着降低，但对于直径为75 mm的晶体，这种影响较小。两种尺寸的晶体中Zn含量的径向变化均很小，证明了ACRT搅拌的好处。为了理解生长机理，已经在这些晶体中研究了宏观和微观偏析效应。锌分布已通过近红外透射，X射线晶格参数测量，原子吸收光谱法（AAS）和俄歇电子能谱仪（AES）进行了评估。最后一种技术用于微偏析研究，而AAS提供锌含量的绝对校准。将与文献中发现的偏析行为进行比较。将显示出低温梯度和低生长速率导致在第一冻结区域中的过冷度，并且这导致在径向和轴向上的显着的锌偏析。当晶体达到完整直径时，径向变化可能会减少，大概是由于ACRT的作用，并且轴向偏析也减少了。

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