Optical properties of excitons in ZnO-based quantum well heterostructures

被引:171
作者
Makino, T
Segawa, Y
Kawasaki, M
Koinuma, H
机构
[1] RIKEN, Inst Phys & Chem Res, Photodynam Res Ctr, Sendai, Miyagi 9800845, Japan
[2] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan
[3] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan
[4] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808577, Japan
关键词
D O I
10.1088/0268-1242/20/4/010
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Recently the developments in the field of II-VI-oxides have been spectacular. Various epitaxial methods have been used to grow epitaxial ZnO layers. Not only epilayers but also sufficiently good-quality multiple quantum wells (MQWs) have been grown by laser molecular-beam epitaxy (laser-MBE). We mainly discuss the experimental aspect of the optical properties of excitons in ZnO-based MQW heterostructures. Systematic temperature-dependent studies of optical absorption and photoluminescence in these MQWs were used to evaluate the well-width dependence and the composition dependence of the major excitonic properties. Based on these data, the localization of excitons, the influence of exciton-phonon interaction and quantum-confined Stark effects are discussed. The optical spectra of dense excitonic systems are shown to be determined mainly by the interaction process between excitons and biexcitons. The high-density excitonic effects play a role in the observation of room-temperature stimulated emission in the ZnO MQWs. The binding energies of exciton and biexciton are enhanced from the bulk values, as a result of quantum-confinement effects.
引用
收藏
页码:S78 / S91
页数:14
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