Enhanced crystallinity, optical conductivity and terahertz cutoff frequency of stacked layers of FeSe2 by Al nanosheets

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dc.authoridAtef Fayez Qasrawi / 0000-0001-8193-6975en_US
dc.authorscopusidAtef Fayez Qasrawi / 6603962677en_US
dc.authorwosidAtef Fayez Qasrawi / R-4409-2019en_US
dc.contributor.authorQasrawi, Atef Fayez
dc.contributor.authorToubasi, Ahmad J.
dc.date.accessioned2023-08-02T10:54:43Z
dc.date.available2023-08-02T10:54:43Z
dc.date.issued2023en_US
dc.departmentİstinye Üniversitesi, Mühendislik ve Doğa Bilimleri Fakültesi, Elektrik-Elektronik Mühendisliği Bölümüen_US
dc.description.abstractHerein a 250 nm thick two stacked layers of FeSe2 (abbreviated as FF) thin films and FF stacks comprising aluminum nanosheets of thicknesses of 50 nm (FAF) are studied. Amorphous FeSe2 thin films are deposited using thermal evaporation technique under a vacuum pressure of 10-5 mbar. It is observed that insertion of Al nanosheets induced the evolution of orthorhombic phase of FeSe2. nanowire and elongated rectangular grains are also formed. Optically Al nanosheets enhanced the light absorption by 4.1 times and redshifted the indirect/direct energy band gaps from 2.80/2.49 eV to 2.42/1.85 eV, respectively. It also improved the optical conductivity and terahertz cutoff frequency as well. In addition the optical conductivity parameters of FF and FAF terahertz resonators are determined by the Drude-Lorentz approach. It is observed that in the infrared range of light Al nanosheets improved the drift mobility of FF from 2.06 cm2/Vs to 12.55 cm2/Vs. The hole density is reduced and the scattering time constant at femtosecond level is increased. FF and FAF terahertz resonators performed as optical filters suitable for terahertz technology applications with terahertz cutoff frequency varying in the range of 17.2-300 THz.en_US
dc.description.sponsorshipThis study was funded by the Deanship of Scientific Research (DSR) at Arab American University, Jenin, Palestine and by Istinye University, Istanbul, TR project number Cycle -1 2023.en_US
dc.identifier.citationQasrawi, A. F., & Toubasi, A. J. (2023). Enhanced Crystallinity, Optical Conductivity and Terahertz Cutoff Frequency of Stacked Layers of FeSe2 by Al Nanosheets. Optik, 171173.en_US
dc.identifier.doi10.1016/j.ijleo.2023.171173en_US
dc.identifier.issn0030-4026en_US
dc.identifier.issn1618-1336en_US
dc.identifier.scopus2-s2.0-85165078518en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage171173en_US
dc.identifier.urihttps://doi.org/10.1016/j.ijleo.2023.171173
dc.identifier.urihttps://hdl.handle.net/20.500.12713/3942
dc.indekslendigikaynakScopusen_US
dc.institutionauthorQasrawi, Atef Fayez
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofOptiken_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectDielectricen_US
dc.subjectFeSe2en_US
dc.subjectOptical Dynamicsen_US
dc.subjectThermal Evaporationen_US
dc.subjectTHzen_US
dc.titleEnhanced crystallinity, optical conductivity and terahertz cutoff frequency of stacked layers of FeSe2 by Al nanosheetsen_US
dc.typeArticleen_US

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