Quantum confined Stark effect of polar and non-polar ZnO/ZnMgO quantum wells grown by MBE
Quantum confined Stark effect of polar and non-polar ZnO/ZnMgO quantum wells grown by MBE
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MBE 生长的极性和非极性 ZnO/ZnMgO 量子阱的量子限制斯塔克效应
DOI：
10.1002/pssc.201510272
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and Kunio Ichino
中科院分区：
文献类型：
--
作者：
Tomoki Abe;Tatsuya Motoyama;Masaya Yamamoto;Atsushi Yamamoto;Shohei Iwagashita;Hirofumi Kasada;Koshi Ando;and Kunio Ichino
利用电吸收（EA）光谱研究了极性（O -极性）和非极性ZnO/ZnMgO量子阱（QWs）的量子受限Stark效应。采用等离子体辅助分子束外延法（PA - MBE）生长ZnO/ZnMgO量子阱。ZnO/ZnMgO量子阱分别生长在c面蓝宝石上，非极性ZnO量子阱生长在r面蓝宝石上。在室温下施加外部偏置，ZnO/ZnMgO极性量子阱的激子跃迁能蓝移达到20 meV。这种蓝移是由于具有c轴取向的纤锌矿ZnO/ZnMgO量子阱的压电电场诱导量子阱结构中的反向量子受限斯塔克效应（QCSE）。我们证实了非极性ZnO/ZnMgO量子阱有29 meV的大红移。这种能量转移源于没有内置压电电场的平势量子阱中的正常量子阱。（©2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim）
We have investigated quantum confined Stark effects of polar (O‐polar) and non‐polar ZnO/ZnMgO quantum wells (QWs) by electroabsorption (EA) spectroscopy. The ZnO/ZnMgO QWs were grown by plasma assisted molecular beam epitaxy (PA‐MBE). The ZnO/ZnMgO QWs were grown on c‐plane sapphire for polar ZnO QWs, and on r‐plane sapphire for non‐polar ZnO QWs, respectively. The polar ZnO/ZnMgO QWs exhibited a blue‐shift of 20 meV in excitonic transition energy by applying external bias at room temperature. This blue‐shift is due to reverse quantum confined Stark effect (QCSE) in a piezo electric‐field induced QW structures of wurtzite ZnO/ZnMgO QWs with c‐axis orientation. We confirmed a large red‐shift of 29 meV for non‐polar ZnO/ZnMgO QWs. This energy shift is originated from normal QCSE in the flat potential QWs without built‐in piezo electric‐field. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)