Density and localized states' impact on amorphous carbon electron transport mechanisms

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Caicedo-Dávila, S. Lopez-Acevedo, O. Velasco-Medina, J. Avila, A. 2018-08-01T12:37:45Z 2018-08-01T12:37:45Z 2016-12-07
dc.identifier.citation Caicedo-Dávila , S , Lopez-Acevedo , O , Velasco-Medina , J & Avila , A 2016 , ' Density and localized states' impact on amorphous carbon electron transport mechanisms ' Journal of Applied Physics , vol 120 , no. 21 , 214303 , pp. 1-9 . DOI: 10.1063/1.4971010 en
dc.identifier.issn 0021-8979
dc.identifier.issn 1089-7550
dc.identifier.other PURE UUID: 0998e52d-954b-4889-b7cc-58c705f7d33f
dc.identifier.other PURE ITEMURL:
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dc.description.abstract This work discusses the electron transport mechanisms that we obtained as a function of the density of amorphous carbon (a-C) ultra-thin films. We calculated the density of states (total and projected), degree of electronic states' localization, and transmission function using the density functional theory and nonequilibrium Green's functions method. We generated 25 sample a-C structures using ab-initio molecular dynamics within the isothermal-isobaric ensemble. We identified three transport regimes as a function of the density, varying from semimetallic in low-density samples ( ≤2.4 g/cm3) to thermally activated in high-density ( ≥2.9 g/cm3) tetrahedral a-C. The middle-range densities (2.4 g/cm3 ≤ρ≤ 2.9 g/cm3) are characterized by resonant tunneling and hopping transport. Our findings offer a different perspective from the tight-binding model proposed by Katkov and Bhattacharyya [J. Appl. Phys. 113, 183712 (2013)], and agree with experimental observations in low-dimensional carbon systems [see S. Bhattacharyya, Appl. Phys. Lett. 91, 21 (2007)]. Identifying transport regimes is crucial to the process of understanding and applying a-C thin film in electronic devices and electrode coating in biosensors. en
dc.format.extent 1-9
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Journal of Applied Physics en
dc.relation.ispartofseries Volume 120, issue 21 en
dc.rights openAccess en
dc.subject.other Physics and Astronomy(all) en
dc.subject.other 114 Physical sciences en
dc.title Density and localized states' impact on amorphous carbon electron transport mechanisms en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Universidad de Los Andes Colombia
dc.contributor.department Department of Applied Physics
dc.contributor.department Universidad del Valle
dc.subject.keyword Physics and Astronomy(all)
dc.subject.keyword 114 Physical sciences
dc.identifier.urn URN:NBN:fi:aalto-201808014067
dc.identifier.doi 10.1063/1.4971010
dc.type.version publishedVersion

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