Disorder and optical properties of amorphous carbon
| dc.contributor.author | Mathioudakis, C. | en |
| dc.contributor.author | Kopidakis, G. | en |
| dc.contributor.author | Patsalas, P. | en |
| dc.contributor.author | Kelires, P. C. | en |
| dc.date.accessioned | 2015-11-24T17:33:17Z | |
| dc.date.available | 2015-11-24T17:33:17Z | |
| dc.identifier.issn | 0925-9635 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/13841 | |
| dc.rights | Default Licence | - |
| dc.subject | amorphous carbon | en |
| dc.subject | simulation | en |
| dc.subject | pulsed laser deposition | en |
| dc.subject | optical properties | en |
| dc.subject | energy-loss spectroscopy | en |
| dc.subject | films | en |
| dc.subject | model | en |
| dc.title | Disorder and optical properties of amorphous carbon | en |
| heal.abstract | Tight-binding calculations shed light onto the link between disorder and optical properties in pure amorphous carbon films. It is shown that the Urbach energy E-boolean OR is an excellent probe of disorder in such films. Our striking finding is that E-boolean OR varies non-monotonically with sp(3) fraction and optical gap, contrary to what is seen experimentally in hydrogenated samples. Firm evidence is provided, supported by experimental measurements, that in dense films the higher the sp(3) fraction the lower the disorder. The Urbach energy has a value of similar to 0.09 eV for the 100% sp(3)- bonded network, it reaches a maximum of similar to 0.3 eV for 65% sp(3) content, and it then declines to low values for low-sp(3) content films. Analysis of cluster distributions and bond-angle and -length distortions reveals that the Urbach edge is associated to both topological and structural disorder. Another notable finding is that the edge is rather insensitive to the spin density due to impaired sp(2) sites. (C) 2007 Elsevier B.V. All rights reserved. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | DOI 10.1016/j.diamond.2007.08.009 | - |
| heal.identifier.secondary | <Go to ISI>://000250949000005 | - |
| heal.identifier.secondary | http://ac.els-cdn.com/S0925963507003469/1-s2.0-S0925963507003469-main.pdf?_tid=6a23ada30a040a8c0807c267299a86c8&acdnat=1339755813_ae8263e598c1a34bb95efb2596f4d1d9 | - |
| heal.journalName | Diamond and Related Materials | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2007 | - |
| heal.publisher | Elsevier | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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