Physics – Condensed Matter – Materials Science
Scientific paper
2004-10-05
Semicond. Sci. Tech. 20(4), p. S78, (2005)
Physics
Condensed Matter
Materials Science
20 pages, 21 figures, RevTeX4 format, topical issue on oxide semiconductors edited by M. Kawasaki, published by Semicond. Sci.
Scientific paper
10.1088/0268-1242/20/4/010
Recently the developments in the field of II-VI-oxides have been spectacular. Various epitaxial methods has been used to grow epitaxial ZnO layers. Not only epilayers but also sufficiently good-quality multiple quantum wells (MQWs) have also been grown by laser molecular-beam epitaxy (laser-MBE). We discuss mainly 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 for 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.
Kawasaki Masahiro
Koinuma H.
Makino Takaki
Segawa Yusaburo
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