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N. TOUKA1,* , B. BOUDINE2, O. HALIMI2, M. SEBAIS2
GaAs nanocrystals (NCs) were prepared using a colloidal solution and dispersed in polystyrene (PS) matrix. Using spin coating technique, thin films deposited on glass substrates were prepared. Their structural and optical properties were investigated by X-ray diffraction, spectroscopy Raman, UV-visible absorption and photoluminescence respectively. The absorption spectra of these dispersed NCs exhibit excitonic peak resulting from the electron-hole coupling transitions. Due to a quantum confinement effect, a blue shift was deduced by comparison of such transition with respect to reported bulk band gap. Assuming a spherical like shape for these NCs, the crystallites radius (R) was estimated by applying the effective mass approximation model and was about ~ 3 nm. Such a weak radius value compared to Bohr radius (RB = 19 nm) leads to a strong quantum confinement regime. Moreover, the influence of this confinement effect on Raman and photoluminescence properties was also studied..
Nanocrystals GaAs, Polystyrene (PS), Quantum confinement, Photoluminescence.
N. TOUKA, B. BOUDINE, O. HALIMI, M. SEBAIS, Structural and optical studies of GaAs nanocrystals embedded into polymer host, Optoelectronics and Advanced Materials - Rapid Communications, 6, 5-6, May-June 2012, pp.583-586 (2012).
Submitted at: Dec. 27, 2011
Accepted at: June 6, 2012
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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