Time-resolved spectroscopy of excitonic transitions in ZnO/(Zn, Mg)O quantum wells

T. Guillet; T. Bretagnon; T. Taliercio; P. Lefebvre; B. Gil; C. Morhain; Xiaodong Tang

doi:10.1016/j.spmi.2007.03.030

Time-resolved spectroscopy of excitonic transitions in ZnO/(Zn, Mg)O quantum wells

T. Guillet^*
, T. Bretagnon
, T. Taliercio
, P. Lefebvre
, B. Gil
, C. Morhain
, Xiaodong Tang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

We report on the optical spectroscopy of a series of ZnO/(Zn, Mg)O quantum wells of different widths, using time-resolved photoluminescence. The samples were grown by molecular beam epitaxy on ZnO templates, themselves deposited on sapphire substrates. The barriers consist of Zn_0.78Mg_0.22O layers. The presence of large internal electric fields in these quantum wells results in a competition between quantum confinement and the quantum confined Stark effect as the quantum well width is varied. A transition energy lying 0.5 eV below the ZnO excitonic gap was observed for the widest of our wells. The PL spectra of the wide quantum wells were obtained using time-integrated photoluminescence, taking a great care with screening effects induced by their very slow dynamics. The effect of the built-in electric field on the excitonic properties was investigated. The excitonic fine structure is shown to depend strongly on the enhancement or suppression of the exchange interaction as a function of the quantum well width.

Original language	English
Pages (from-to)	352-359
Number of pages	8
Journal	Superlattices and Microstructures
Volume	41
Issue number	5-6
DOIs	https://doi.org/10.1016/j.spmi.2007.03.030
State	Published - May 2007
Externally published	Yes

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title = "Time-resolved spectroscopy of excitonic transitions in ZnO/(Zn, Mg)O quantum wells",

abstract = "We report on the optical spectroscopy of a series of ZnO/(Zn, Mg)O quantum wells of different widths, using time-resolved photoluminescence. The samples were grown by molecular beam epitaxy on ZnO templates, themselves deposited on sapphire substrates. The barriers consist of Zn0.78Mg0.22O layers. The presence of large internal electric fields in these quantum wells results in a competition between quantum confinement and the quantum confined Stark effect as the quantum well width is varied. A transition energy lying 0.5 eV below the ZnO excitonic gap was observed for the widest of our wells. The PL spectra of the wide quantum wells were obtained using time-integrated photoluminescence, taking a great care with screening effects induced by their very slow dynamics. The effect of the built-in electric field on the excitonic properties was investigated. The excitonic fine structure is shown to depend strongly on the enhancement or suppression of the exchange interaction as a function of the quantum well width.",

author = "T. Guillet and T. Bretagnon and T. Taliercio and P. Lefebvre and B. Gil and C. Morhain and Xiaodong Tang",

year = "2007",

month = may,

doi = "10.1016/j.spmi.2007.03.030",

language = "英语",

volume = "41",

pages = "352--359",

journal = "Superlattices and Microstructures",

issn = "0749-6036",

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}

TY - JOUR

T1 - Time-resolved spectroscopy of excitonic transitions in ZnO/(Zn, Mg)O quantum wells

AU - Guillet, T.

AU - Bretagnon, T.

AU - Taliercio, T.

AU - Lefebvre, P.

AU - Gil, B.

AU - Morhain, C.

AU - Tang, Xiaodong

PY - 2007/5

Y1 - 2007/5

N2 - We report on the optical spectroscopy of a series of ZnO/(Zn, Mg)O quantum wells of different widths, using time-resolved photoluminescence. The samples were grown by molecular beam epitaxy on ZnO templates, themselves deposited on sapphire substrates. The barriers consist of Zn0.78Mg0.22O layers. The presence of large internal electric fields in these quantum wells results in a competition between quantum confinement and the quantum confined Stark effect as the quantum well width is varied. A transition energy lying 0.5 eV below the ZnO excitonic gap was observed for the widest of our wells. The PL spectra of the wide quantum wells were obtained using time-integrated photoluminescence, taking a great care with screening effects induced by their very slow dynamics. The effect of the built-in electric field on the excitonic properties was investigated. The excitonic fine structure is shown to depend strongly on the enhancement or suppression of the exchange interaction as a function of the quantum well width.

AB - We report on the optical spectroscopy of a series of ZnO/(Zn, Mg)O quantum wells of different widths, using time-resolved photoluminescence. The samples were grown by molecular beam epitaxy on ZnO templates, themselves deposited on sapphire substrates. The barriers consist of Zn0.78Mg0.22O layers. The presence of large internal electric fields in these quantum wells results in a competition between quantum confinement and the quantum confined Stark effect as the quantum well width is varied. A transition energy lying 0.5 eV below the ZnO excitonic gap was observed for the widest of our wells. The PL spectra of the wide quantum wells were obtained using time-integrated photoluminescence, taking a great care with screening effects induced by their very slow dynamics. The effect of the built-in electric field on the excitonic properties was investigated. The excitonic fine structure is shown to depend strongly on the enhancement or suppression of the exchange interaction as a function of the quantum well width.

UR - https://www.scopus.com/pages/publications/34250162500

U2 - 10.1016/j.spmi.2007.03.030

DO - 10.1016/j.spmi.2007.03.030

M3 - 文章

AN - SCOPUS:34250162500

SN - 0749-6036

VL - 41

SP - 352

EP - 359

JO - Superlattices and Microstructures

JF - Superlattices and Microstructures

IS - 5-6

ER -

Time-resolved spectroscopy of excitonic transitions in ZnO/(Zn, Mg)O quantum wells

Abstract

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