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Internal electric field in wurtzite ZnOZn0.78Mg0.22O quantum wells

C. Morhain, T. Bretagnon, P. Lefebvre, X. Tang, P. Valvin, T. Guillet, B. Gil, T. Taliercio, M. Teisseire-Doninelli, B. Vinter, and C. Deparis
Phys. Rev. B 72, 241305(R) – Published 12 December 2005

Abstract

Continuous-wave, time-integrated, and time-resolved photoluminescence experiments are used to study the excitonic optical recombinations in wurtzite ZnOZn0.78Mg0.22O quantum wells of varying widths. By comparing experimental results with a variational calculation of excitonic energies and oscillator strengths, we determine the magnitude (0.9MVcm) of the longitudinal electric field that is induced by both spontaneous and piezoelectric polarizations. The quantum-confined Stark effect counteracts quantum confinement effects for well widths larger than 3nm, leading to emission energies that can lie 0.5eV below the ZnO excitonic gap and to radiative lifetimes that can be larger than milliseconds.

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  • Received 5 October 2005

DOI:https://doi.org/10.1103/PhysRevB.72.241305

©2005 American Physical Society

Authors & Affiliations

C. Morhain1, T. Bretagnon2, P. Lefebvre2,*, X. Tang1, P. Valvin2, T. Guillet2, B. Gil2, T. Taliercio2, M. Teisseire-Doninelli1, B. Vinter1, and C. Deparis1

  • 1Centre de Recherche sur l’Hétéro-Epitaxie et ses Applications—CNRS, Rue Bernard Grégory, F-06560 Valbonne, France
  • 2Groupe d’Etude des Semiconducteurs—CNRS—Université Montpellier II, Case Courrier 074, F-34095 Montpellier Cedex 5, France

  • *Corresponding author.

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Issue

Vol. 72, Iss. 24 — 15 December 2005

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