期刊
PHYSICAL REVIEW B
卷 94, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.115209
关键词
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资金
- National Science Council (NSC) in Taiwan
- German Academic Exchange Service (DAAD) in Germany [100-2911-I-006-016-2]
- Ministry of Science and Technology (MOST) in Taiwan [104-2917-I-564-079]
- Fonds National Suisse de la Recherche Scientifique [161032]
We investigate the optical properties of type-I-1 basal-plane stacking faults ( BSFs) in ZnO and Zn1-xMgxO by cathodoluminescence spectroscopy supported by envelope function calculations. We report on a quantum-well-like band alignment of the I-1 BSFs in ZnO taking into account the spontaneous polarization as well as an intrinsic self-screening effect on the polarization-related electric field. We present a systematic investigation of the luminescence properties associated with I-1 BSFs in Zn1-xMgxO for varying Mg content ( 0 <= x <= 0.1) using spatially and spectrally resolved cathodoluminescence spectroscopy. Both the near-band-edge emission and the luminescence line related to the I-1 BSF exhibit the expected blueshift and line broadening with increasing Mg content. We propose a band diagram to describe the recombination mechanism of excitons in a Zn1-xMgxO film containing I-1 BSFs. Based on a statistical analysis, we compile the experimentally obtained I-1 BSF emission energies of Zn1-xMgxO samples and establish a linear dependence of the I-1 BSF-related emission energy on the Mg content. This correlation provides an alternative way to identify the presence of I-1 BSFs in Zn1-xMgxO without the necessity of sophisticated transmission electron microscopy investigations.
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