We investigated ZnCdSe/ZnSe quantum-dot structures which include planar and coherently strained three-dimensional islands with different sizes. Optical excitation of these islands well below the ZnSe band gap leads to a resonant enhancement of the longitudinal-optical (LO) phonon-scattering efficiency and makes the 2LO and 3LO multiphonon emission observable. Resonant excitation with a power density of about 1.3 MW/cm2 using a micro-Raman setup results in an exponential decrease of the 1LO, 2LO, and 3LO intensity with irradiation time. This decay behavior is not observed for pure ZnSe crystals and can be avoided for the ZnCdSe/ZnSe structures using much lower excitation densities. The decrease in intensity is accompanied by a shift of the LO mode to higher frequencies resulting from a lower cadmium concentration in the alloy. From these experimental findings, we conclude that resonant excitation at a certain power density leads to cadmium out-diffusion from the planar quantum dots, which shifts the resonance away from the excitation energy.
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8 May 2000
Research Article|
May 08 2000
Temporal evolution of resonant Raman-scattering in ZnCdSe quantum dots
A. Kaschner;
A. Kaschner
Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany
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M. Strassburg;
M. Strassburg
Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany
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A. Hoffmann;
A. Hoffmann
Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany
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C. Thomsen;
C. Thomsen
Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany
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M. Bartels;
M. Bartels
Fachbereich 6-Physik, Universität Paderborn, 33098 Paderborn, Germany
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K. Lischka;
K. Lischka
Fachbereich 6-Physik, Universität Paderborn, 33098 Paderborn, Germany
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D. Schikora
D. Schikora
Fachbereich 6-Physik, Universität Paderborn, 33098 Paderborn, Germany
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Appl. Phys. Lett. 76, 2662–2664 (2000)
Article history
Received:
January 05 2000
Accepted:
March 17 2000
Citation
A. Kaschner, M. Strassburg, A. Hoffmann, C. Thomsen, M. Bartels, K. Lischka, D. Schikora; Temporal evolution of resonant Raman-scattering in ZnCdSe quantum dots. Appl. Phys. Lett. 8 May 2000; 76 (19): 2662–2664. https://doi.org/10.1063/1.126436
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