Resonant inelastic light scattering and photoluminescence in isolated nc-Si/SiO2 quantum dots

• Published in: Semiconductors (Woodbury, N.Y.) Vol. 47; no. 5; pp. 623 - 627
• Main Authors: Bairamov, F. B., Toporov, V. V., Poloskin, E. D., Bairamov, H., Röder, C., Sprung, C., Bohmhammel, K., Seidel, J., Irmer, G., Lashkul, A., Lähderanta, E., Song, Y. W.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.05.2013
• Subjects: Low-Dimensional Systems; Magnetic Materials; Magnetism; Physics; Physics and Astronomy; Quantum Phenomena; Semiconductor Structures; Optical Phonon; Silicon Bulk Crystal; Colloidal Chemistry Method; Inelastic Light; Lorenz Curve
• ISSN: 1063-7826; 1090-6479
• DOI: 10.1134/S106378261302005X

Observation at the room temperature the spectra of the resonant inelastic light scattering by the spatially confined optical phonons as well as the excitonic luminescence caused by confinement effects in the ensemble of isolated quantum dots (QDs) nc -Si/SiO 2 is reported. It is shown that the samples investigated are high purity and high crystalline perfection quality nc -Si/SiO 2 QDs without amorphous phase α-Si and contaminants. Comparison between the experimental data obtained and phenomenological model of the strong space confinement of optical phonons revealed the need of the more accurate form of the weighted function for the confinement of optical phonons. It is shown that simultaneous detection of the inelastic light scattering by the confinement of phonons and the excitonic luminescence spectra by the confined electron-hole pairs in the nc -Si/SiO 2 QDs allows selfconsistently to determine more accurate values of the diameter of the nc -Si/SiO 2 QDs.