DENSITY-OF-STATES AND OPTICAL PROPERTIES IN AMORPHOUS CARBON THIN FILMS

Autor:	Alberto Tagliaferro, Giovanni Fanchini, E. Emelli
Rok vydání:	2000
Předmět:	Materials science Condensed matter physics Gaussian Fermi level chemistry.chemical_element Statistical and Nonlinear Physics Charge (physics) Electronic structure Dielectric Condensed Matter Physics symbols.namesake chemistry Amorphous carbon symbols Density of states Carbon
Zdroj:	International Journal of Modern Physics B. 14:243-255
ISSN:	1793-6578 0217-9792
DOI:	10.1142/s0217979200000248
Popis:	In this paper we will link the local structure of amorphous carbon and the semi-empirical model which assumes the density of π and π* states as having Gaussian shapes and to be symmetrical with respect to Fermi level. We will show that the effect of charge transfer from sp3 to sp2 sites due their difference in electron-negativity, when coupled with the disorder effect (taken into account by assuming Gaussian distribution of the amount of charge transfer) lead to a sum of Gaussian symmetrical bands. Moreover, we will show that the sp2 pairs are responsible for most of the joint density-of-states (i.e. the imaginary part of the dielectric constant) in the visible region. The limits of the approach will be discussed as well.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5362bb91b6c9ecc9f011ed53df66195d https://doi.org/10.1142/s0217979200000248 Zobrazit plný text záznamu