Enhancement of exciton binding energies in ZnO/ZnMgO multiquantum wells

H. D. Sun; T. Makino; Y. Segawa; M. Kawasaki; A. Ohtomo; K. Tamura; H. Koinuma

doi:10.1063/1.1445280

journal article Feb 15, 2002

Enhancement of exciton binding energies in ZnO/ZnMgO multiquantum wells

H. D. Sun T. Makino Y. Segawa M. Kawasaki

A. Ohtomo K. Tamura H. Koinuma

Journal of Applied Physics Vol. 91 No. 4 pp. 1993-1997 · AIP Publishing

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Abstract

The effect of confinement on the exciton binding energies has been systematically investigated for two series of ZnO/ZnMgO multiquantum wells with various well widths and barrier heights. The exciton binding energies were extracted from the energy difference between the stimulated emission band induced by inelastic exciton–exciton scattering and the free exciton absorption band. The binding energies of excitons are found to be sensitively dependent on the well widths. The experimental results of the well width dependence of binding energies are in good agreement with Coli and Bajaj’s theoretical calculations for these structures [G. Coli and K. K. Bajaj, Appl. Phys. Lett. 78, 2861 (2001)]. The remarkable reduction in coupling strength between excitons and longitudinal optical phonons is closely correlated with the enhancement of the exciton binding energy, indicating that the stability of excitons is greatly increased by the enhancement of exciton binding energy in quantum wells.

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Details

Published: Feb 15, 2002
Vol/Issue: 91(4)
Pages: 1993-1997

Authors

H

H. D. Sun

Photodynamics Research Center, Institute of Physical and Chemical Research (RIKEN), Sendai 980-0845, Japan

T

T. Makino

Photodynamics Research Center, Institute of Physical and Chemical Research (RIKEN), Sendai 980-0845, Japan

Y

Y. Segawa

Photodynamics Research Center, Institute of Physical and Chemical Research (RIKEN), Sendai 980-0845, Japan

M

M. Kawasaki

Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Japan

A

A. Ohtomo

Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Japan

K

K. Tamura

Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Japan

H

H. Koinuma

Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan

Cite This Article

H. D. Sun, T. Makino, Y. Segawa, et al. (2002). Enhancement of exciton binding energies in ZnO/ZnMgO multiquantum wells. Journal of Applied Physics, 91(4), 1993-1997. https://doi.org/10.1063/1.1445280

Enhancement of exciton binding energies in ZnO/ZnMgO multiquantum wells

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