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Excitonic and biexcitonic recombination in undoped and modulation-doped Zn1xCdxSe/ZnSe quantum-well structures

L. Calcagnile, D. Cannoletta, R. Cingolani, M. Lomascolo, M. Di Dio, L. Vanzetti, L. Sorba, and A. Franciosi
Phys. Rev. B 55, R13413(R) – Published 15 May 1997
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Abstract

Undoped and modulated-doped Zn1xCdxSe/ZnSe multiple quantum wells have been investigated in order to elucidate the role of biexcitons in the physical mechanism responsible for stimulated emission. Though biexcitons are clearly observed in undoped samples at 10 K, the temperature and density dependence of the intensity of the biexcitonic features clearly shows that in the normal operating conditions of quantum-well lasers biexcitons are not stable. Comparison of the energy of the stimulated emission in undoped versus modulation-doped samples allowed us to attribute the origin of lasing to the recombination of localized excitons.

    DOI:https://doi.org/10.1103/PhysRevB.55.R13413

    ©1997 American Physical Society

    Authors & Affiliations

    L. Calcagnile, D. Cannoletta, and R. Cingolani

    • Istituto Nazionale per la Fisica della Materia-Dipartimento di Scienza dei Materiali, Universitádi Lecce, via Arnesano,

    M. Lomascolo and M. Di Dio

    • Centro Nazionale Ricerca e Sviluppo Materiali (PASTIS-CNRSM), SS 7 Appia Km 713, I-72100 Brindisi, Italy

    L. Vanzetti, L. Sorba, and A. Franciosi

    • Laboratorio Tecnologie Avanzate Superfici e Catalisi del l'Istituto Nazionale per la Fisica della Materia, Area di Ricerca,

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    Issue

    Vol. 55, Iss. 20 — 15 May 1997

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