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The segregation of impurities and the self‐compensation problem in II‐VI compounds

机译：II-VI化合物中的杂质偏析和自补偿问题

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The electrical and optical properties of ZnTe or CdTe crystals are generally inhomogeneous after annealing. This is shown to be due to the redistribution of preexisting impurities. Indeed, after growth, these crystals contain some excess tellurium which must precipitate since the solidus line has a retrograde shape. The liquid Te droplets are then able to purify the surrounding materials by a solid‐liquid segregation mechanism. On annealing, the tellurium excess can disappear more or less rapidly: the Te precipitates and the small inclusions shrink progressively while the impurities are released into the crystal. This mechanism explains the bright dots observed in the scanning electron microscope (cathodoluminescence mode) and due to the high lithium concentration. Under other conditions, dark dots are obtained and the role of copper is suspected. This model is discussed on the basis of the available data (segregation and diffusion coefficients). Further confirmation is obtained from direct chemical analysis of the crystal and of the inclusions itself. The consequences of the segregation of impurities on the interpretation of the self‐compensation problem are analyzed. A fully satisfactory interpretation of conductivity variation with zinc pressure previously attributed to the zinc vacancy, can be derived with the single hypothesis that acceptor and donor impurities in sufficient amount are stored in the crystal. The dominant role of residual impurities in the close control of the II‐VI materials is particularly emphasized.
机译：退火后，ZnTe或CdTe晶体的电学和光学性质通常是不均匀的。显示这是由于先前存在的杂质的重新分布。实际上，在生长之后，这些晶体包含一些过量的碲，由于固相线具有逆行形状，这些碲必须沉淀出来。然后，液态Te液滴可通过固液分离机制纯化周围的物质。退火时，碲过量或多或少会迅速消失：Te沉淀，小的夹杂物逐渐收缩，而杂质则释放到晶体中。该机理解释了在扫描电子显微镜（阴极发光模式）中观察到的亮点以及由于锂浓度高而引起的亮点。在其他条件下，会获得黑点，怀疑是铜的作用。在可用数据（隔离系数和扩散系数）的基础上讨论该模型。从晶体和夹杂物本身的直接化学分析获得了进一步的证实。分析了杂质分离对自补偿问题解释的影响。可以用单个假设得出充分令人满意的电导率随锌压力变化的解释，而锌压力先前归因于锌的空位，该假说是将足够量的受体和施主杂质存储在晶体中。特别强调了残留杂质在II-VI材料的紧密控制中的主要作用。

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    《Journal of Applied Physics》 |1982年第12期|P.8668-8677|共10页
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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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