Photoluminescence due to isoelectric oxygen and tellurium traps in II–VI alloys
Photoluminescence due to isoelectric oxygen and tellurium traps in II–VI alloys
复制标题
II-VI 族合金中等电点氧和碲陷阱引起的光致发光
DOI：
10.1016/0022-2313(70)90002-5
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发表时间：
1970
影响因子：
3.6
通讯作者：
A. Strauss
中科院分区：
文献类型：
--
作者：
G. Iseler;A. Strauss
在以下由二元化合物的粉末混合物退火制备的II-VI族固溶体中观察到了由于氧和碲的等电子陷阱引起的4.2°K光致发光光谱：ZnTe 1 − xSx、ZnTe 1 −xSx和Zn 1 −yCdyTe中的O; Zn 1 − yCdyS、Zn 1 −yCdySe、ZnS 1 − xSex、CdS 1 −xSex和ZnTe 1 −xSex中的Te。在所有情况下，捕获能量与合金成分的定性变化，如由光致发光能量相对于能隙的变化所指示的，与等电子陷阱模型是一致的。根据这个模型，束缚在陷阱中的激子的捕获能量应该主要取决于杂质和它所取代的宿主原子之间的电负性差异。对于在阴离子亚晶格上有替代的合金，俘获能随x的增加而显著降低，但ZnTe 1 −xSex中的Te除外，在那里发生了相反的变化。对于涉及阳离子亚晶格上的替代的合金，捕获能不强烈依赖于ony。
Photoluminescence spectra at 4.2°K due to oxygen and tellurium isoelectronic traps have been observed in the following II–VI solid solutions prepared by annealing powder mixtures of the binary compounds: O inZnTe1−xSex,ZnTe1−xSx, andZn1−yCdyTe; Te inZn1−yCdyS,Zn1−yCdySe,ZnS1−xSex,CdS1−xSex, andZnTe1−xSex. In all cases the qualitative change in trapping energy with alloy composition, as indicated by the change in photolumunescence energy relative to the energy gap, is consistent with the isoelectronic trap model. According to this model, the trapping energy for an exciton bound to the trap should depend primarily on the difference in electronegativity between the impurity and the host atom which it replaces. For alloys involving substitution on the anion sub-lattice, the trapping energy decreases markedly with increasingxexcept for Te inZnTe1−xSex, where the opposite change occurs. For alloys involving substitution on the cation sub-lattice, the trapping energy does not depend strongly ony.