dc.contributor.author | Vatanparast, Maryam | |
dc.date.accessioned | 2017-10-31T13:07:32Z | |
dc.date.available | 2017-10-31T13:07:32Z | |
dc.date.created | 2017-06-29T15:31:21Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Ultramicroscopy. 2017, 182 92-98. | nb_NO |
dc.identifier.issn | 0304-3991 | |
dc.identifier.uri | http://hdl.handle.net/11250/2463211 | |
dc.description.abstract | In the present work Cs aberration corrected and monochromated scanning transmission electron microscopy electron energy loss spectroscopy (STEM-EELS) has been used to explore experimental set-ups that allow bandgaps of high refractive index materials to be determined. Semi-convergence and –collection angles in the µrad range were combined with off-axis or dark field EELS to avoid relativistic losses and guided light modes in the low loss range to contribute to the acquired EEL spectra. Off-axis EELS further supressed the zero loss peak and the tail of the zero loss peak. The bandgap of several GaAs-based materials were successfully determined by simple regression analyses of the background subtracted EEL spectra. The presented set-up does not require that the acceleration voltage is set to below the Čerenkov limit and can be applied over the entire acceleration voltage range of modern TEMs and for a wide range of specimen thicknesses. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | Elsevier | nb_NO |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no | * |
dc.title | Bandgap measurement of high refractive index materials by off-axis EELS | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.description.version | acceptedVersion | nb_NO |
dc.source.pagenumber | 92-98 | nb_NO |
dc.source.volume | 182 | nb_NO |
dc.source.journal | Ultramicroscopy | nb_NO |
dc.identifier.doi | 10.1016/j.ultramic.2017.06.019 | |
dc.identifier.cristin | 1479958 | |
dc.description.localcode | © 2017. This is the authors’ accepted and refereed manuscript to the article. LOCKED until 20.6.2019 due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | nb_NO |
cristin.unitcode | 194,66,20,0 | |
cristin.unitname | Institutt for fysikk | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |