Optical phonons and electron-phonon coupling in CdSxSe1-x quantum dots

Vincenzo Spagnolo; Gaetano Scamarcio; G. Ventruti; M. Lugara; Michele Ferrara; Ida Marie Catalano; Giancarlo C. Righini

doi:10.1117/12.226211

3 November 1995 Optical phonons and electron-phonon coupling in CdS_xSe_1-x quantum dots

Vincenzo Spagnolo, Gaetano Scamarcio, G. Ventruti, M. Lugara, Michele Ferrara, Ida Marie Catalano, Giancarlo C. Righini

Proceedings Volume 2648, International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics; (1995) https://doi.org/10.1117/12.226211
Event: International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics, 1995, Kiev, Ukraine

Abstract

Absorption, photoluminescence, and Raman scattering studies of CdS_xSe_1-x nanocrystals, as a function of the crystallite mean radius, are reported. By properly considering the competing effects of spatial localization and strain, the chemical composition and the lattice contraction are assessed. Two different techniques have been used to analyze the electron-phonon coupling. Photoluminescence and absorption studies allow us to measure the Huang-Rhys parameter. The size dependence of the Frohlich electron-LO phonon interaction has been extracted, for the first time, from the polarization analysis of the Raman scattering. Our results unambiguously show that, in the investigated nanocrystal size range, the electron-phonon coupling monotonically increases at decreasing the nanocrystal radius. The observed behavior is in agreement with the latest calculations.

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Vincenzo Spagnolo, Gaetano Scamarcio, G. Ventruti, M. Lugara, Michele Ferrara, Ida Marie Catalano, and Giancarlo C. Righini "Optical phonons and electron-phonon coupling in CdS_xSe_1-x quantum dots", Proc. SPIE 2648, International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics, (3 November 1995); https://doi.org/10.1117/12.226211

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