Barrier composition dependence of the internal electric field in ZnO/Zn1- xMgxO quantum wells
Barrier composition dependence of the internal electric field in ZnO/Zn1- xMgxO quantum wells
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DOI：
10.1063/1.2740576
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发表时间：
2007-05
影响因子：
4
通讯作者：
T. Bretagnon;P. Lefebvre;T. Guillet;T. Taliercio;B. Gil;C. Morhain
中科院分区：
文献类型：
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作者：
T. Bretagnon;P. Lefebvre;T. Guillet;T. Taliercio;B. Gil;C. Morhain
利用时间积分光致发光实验研究了不同宽度和镁组分的纤锌矿ZnO scinZn1 −xMgxO单量子威尔斯阱中的激子光学复合。通过比较实验结果与激子能量的变分计算，作者确定的内置电场的幅度，这是由自发和压电极化引起的。结果表明，电场强度与镁的成分呈线性关系。通过考虑多量子威尔斯阱中势垒层和阱层之间的电场分布，作者证明了他们的结果与以前报道的数据是完全一致的。
Time-integrated photoluminescence experiments are used to study the excitonic optical recombinations in wurtzite ZnO∕Zn1−xMgxO single quantum wells of varying widths and magnesium compositions. By comparing experimental results with a variational calculation of excitonic energies, the authors determine the magnitude of the built-in electric field that is induced by both spontaneous and piezoelectric polarizations. It is found that the electric field varies linearly with magnesium composition. By taking into consideration the well-known distribution of electric field among the barrier and the well layers in multiquantum wells, the authors show that their results are fully consistent with previously reported data.