In Situ Observation of Heat-Assisted Hexagonal-Orthorhombic Phase Transitions in Se/Ag Sandwiched Structures and Their Effects on Optical Properties

dc.authorid Qasrawi, Atef Fayez/0000-0001-8193-6975
dc.authorscopusid 6603962677
dc.authorscopusid 57209246891
dc.authorwosid Qasrawi, Atef Fayez/R-4409-2019
dc.contributor.author Qasrawi, A. F.
dc.contributor.author Aloushi, Hadil D.
dc.contributor.other Department of Electrical & Electronics Engineering
dc.date.accessioned 2024-07-05T15:41:42Z
dc.date.available 2024-07-05T15:41:42Z
dc.date.issued 2019
dc.department Atılım University en_US
dc.department-temp [Qasrawi, A. F.; Aloushi, Hadil D.] Arab Amer Univ, Dept Phys, Jenin, Palestine; [Qasrawi, A. F.] Atilim Univ, Fac Engn, Grp Phys, TR-06836 Ankara, Turkey en_US
dc.description Qasrawi, Atef Fayez/0000-0001-8193-6975 en_US
dc.description.abstract In this work, two selenium layers of 500-nm thickness, nano-sandwiched with Ag nanosheets of 100-nm thickness (Se/Ag/Se), are subjected to in situ monitoring of the structural and optical transitions during heating over a temperature range of 303-473 K by x-ray diffraction and ultraviolet-visible light spectrophotometry, respectively. The Se/Ag/Se thin films are observed to exhibit a transformation from an amorphous to a polycrystalline phase at 343 K. Increasing the temperature above 363 K enhances the crystallinity of the hexagonal phase, reduces the microstrain, increases the crystallite size and reduces the defect density. Accordingly, the optical absorption spectra are redshifted upon heating. The redshift is accompanied by a transition in the energy band gap from 2.03 eV to 1.85 eV as the material structural phase is transformed from amorphous to polycrystalline. Increasing the temperature causes the energy band gap to shrink. Another permanent phase transformation from hexagonal to orthorhombic is detected when the Se/Ag/Se system is allowed to cool. Scanning electron microscopy images show that the phase transformation converts the grains of Se/Ag/Se films from wire-shaped to nanotubes. The second phase transformation causes a blueshift in the absorption coefficient spectra and increases the energy band gap. The structural and optical parameter enhancements achieved via heating render the Se thin films more suitable for optoelectronic applications. en_US
dc.identifier.citationcount 3
dc.identifier.doi 10.1007/s11664-019-07628-2
dc.identifier.endpage 7914 en_US
dc.identifier.issn 0361-5235
dc.identifier.issn 1543-186X
dc.identifier.issue 12 en_US
dc.identifier.scopus 2-s2.0-85073958561
dc.identifier.startpage 7906 en_US
dc.identifier.uri https://doi.org/10.1007/s11664-019-07628-2
dc.identifier.uri https://hdl.handle.net/20.500.14411/3483
dc.identifier.volume 48 en_US
dc.identifier.wos WOS:000519972500036
dc.identifier.wosquality Q3
dc.institutionauthor Qasrawı, Atef Fayez Hasan
dc.language.iso en en_US
dc.publisher Springer en_US
dc.relation.publicationcategory Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı en_US
dc.rights info:eu-repo/semantics/closedAccess en_US
dc.scopus.citedbyCount 4
dc.subject Selenium en_US
dc.subject thermal-assisted crystallization en_US
dc.subject hexagonal en_US
dc.subject optical properties en_US
dc.title In Situ Observation of Heat-Assisted Hexagonal-Orthorhombic Phase Transitions in Se/Ag Sandwiched Structures and Their Effects on Optical Properties en_US
dc.type Article en_US
dc.wos.citedbyCount 3
dspace.entity.type Publication
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