Internal electric field in wurtzite ZnO/Zn0.78Mg0.22O quantum wells -: art. no. 241305

被引：212

作者：

Morhain, C

Bretagnon, T

Lefebvre, P

Tang, X

Valvin, P

Guillet, T

Gil, B

Taliercio, T

Teisseire-Doninelli, M

Vinter, B

Deparis, C

机构：

[1] Univ Montpellier 2, CNRS, Etud Semicond Grp, F-34095 Montpellier 5, France

[2] CNRS, Ctr Rech Heteroepitazie & Applicat, F-06560 Valbonne, France

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.72.241305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Continuous-wave, time-integrated, and time-resolved photoluminescence experiments are used to study the excitonic optical recombinations in wurtzite ZnO/Zn0.78Mg0.22O quantum wells of varying widths. By comparing experimental results with a variational calculation of excitonic energies and oscillator strengths, we determine the magnitude (0.9 MV/cm) 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 3 nm, leading to emission energies that can lie 0.5 eV below the ZnO excitonic gap and to radiative lifetimes that can be larger than milliseconds.

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页数：4

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