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https://open.uns.ac.rs/handle/123456789/16228
Nаziv: | Dielectric properties of ultrathin films of molecular crystals | Аutоri: | Lazarev S. Mirjanić D. Mitranić L. Pantić, Milan |
Dаtum izdаvаnjа: | 1-јан-2003 | Čаsоpis: | Journal of Physics and Chemistry of Solids | Sažetak: | Dielectric properties of thin films (TF) of molecular crystals, including the effect of size and the boundary surfaces were analysed using Green's function method. Polarisability of molecules in various film layers and dielectric susceptibility of TF were calculated. A comparison with crystal bulk has shown that dielectric properties of TF are strongly influenced both by the sample dimensions and by the boundary conditions. The frequency dependence of the dielectric susceptibility has also been derived. One obtains the monotonous variation for the frequencies above and below exciton band. However, for the frequencies within the exciton band there appears to be complicated, non-monotonous dependence. The relationship between the dielectric susceptibility and the film width for the same frequency shows a complex, oscillatory behaviour. Furthermore, the amplitude of these oscillations increases with increasing film width, demanding the introduction of a damping factor. Finally, the thickness dependence of dielectric susceptibility was analysed in the Cole-Cole plot. © 2003 Published by Elsevier Science Ltd. | URI: | https://open.uns.ac.rs/handle/123456789/16228 | ISSN: | 00223697 | DOI: | 10.1016/S0022-3697(02)00201-9 |
Nаlаzi sе u kоlеkciјаmа: | PMF Publikacije/Publications |
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