期刊
PHYSICS LETTERS A
卷 378, 期 30-31, 页码 2251-2255出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2014.05.015
关键词
Built-in electric fields; Optical properties; ZnO/MgZnO QWs
资金
- basic research projects with cutting-edge technology of Henan Province [122300413208]
- National Natural Science Foundation of China [11274280]
Based on the effective-mass approximation, the built-in electric field, exciton states and optical properties are investigated theoretically in the wurtzite (WZ) ZnO/MgZnO quantum wells (QWs). Numerical results show that the built-in electric field, exciton states and optical properties can be tuned effectively by the MgZnO barrier layer in the QWs. When the MgZnO barrier width is decreased, the built-in electric field F-w and the interband emission wavelength are decreased. However, the exciton binding energy and the electron-hole recombination rate increase with increasing the MgZnO barrier width. In particular, the electron-hole recombination rate approaches zero when the QWs structural parameters are large in the WZ ZnO/MgZnO QWs. (C) 2014 Elsevier B.V. All rights reserved.
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