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Optical properties from photoelectron energy-loss spectroscopy of low-temperature aqueous chemically synthesized ZnO nanorods grown on Si
Univ Fed Bahia, Inst Fis, Campus Ondina, BR-40210340 Salvador, BA, Brazil. lnoor, Hatim; Nur, Omer; Willander, Magnus.ORCID iD: 0000-0001-5956-4757
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2019 (English)In: Semiconductor Science and Technology, ISSN 0268-1242, E-ISSN 1361-6641, Vol. 34, no 4, article id 045019Article in journal (Refereed) Published
Abstract [en]

The optical properties of zinc oxide (ZnO) nanorods (NRs) synthesized by the low-temperature aqueous chemical method on top of silicon (Si) substrate have been investigated by means of photoelectron energy loss spectroscopy (PEELS). The ZnO NRs were obtained by the low temperature aqueous chemical synthesis on top of Si substrate. The measured valence band, the dynamical dielectric functions and optical absorption of the material show a reasonable agreement when the trending and shape of the theoretical calculations are considered. A first-principle calculation based on density functional theory (DFT) was performed using the partially self-consistent GW approximation (scGW(0)) and compared to the experimental results. The application of these two techniques brings a new analysis of the electronic properties of this material. The experimental results regarding the density of states (DOS) obtained for the valence band using x-ray photoelectron spectroscopy (XPS) was found to be consistent with the theoretical calculated value. Due to this consistency, the same wavefunctions was then employed to calculate the dielectric function of the ZnO NRs. The experimentally extracted dielectric function was also consistent with the calculated values.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2019. Vol. 34, no 4, article id 045019
Keywords [en]
ZnO nanorods, optical properties, density of states, dielectric function, density functional theory
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-248324DOI: 10.1088/1361-6641/ab0bc4ISI: 000461940800007Scopus ID: 2-s2.0-85065663820OAI: oai:DiVA.org:kth-248324DiVA, id: diva2:1303261
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QC 20190409

Available from: 2019-04-09 Created: 2019-04-09 Last updated: 2020-03-09Bibliographically approved

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Baldissera, GustavoPersson, Clas

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