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Article: IP and OOP ferroelectricity in hexagonal γ-In2Se3 nanoflakes grown by chemical vapor deposition

TitleIP and OOP ferroelectricity in hexagonal γ-In2Se3 nanoflakes grown by chemical vapor deposition
Authors
Keywordsγ-In2Se3
Chemical vapour deposition
Ferroelectric response
Raman spectroscopy
Second harmonic generation
Issue Date2021
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jallcom
Citation
Journal of Alloys and Compounds, 2021, v. 870, p. article no. 159344 How to Cite?
AbstractIndium selenide (In2Se3) has got much recent attraction in a variety of research areas mainly due to its multiphase structure. Many existing studies, however, have focused on growth of α and β phase, while chemical vapor deposition (CVD) growth of the γ-phase has only been achieved for micon-thick flakes with the assistance of iodine trichloride (ICl3) catalysts. Here, we present the “catalyst-free” CVD growth of β and γ phase In2Se3 flakes with thicknesses down to only a few nanometers. The structural, optical and ferroelectric properties of the grown samples were investigated carefully by using various techniques. Optical microscope and Raman spectroscopy studies revealed that triangular and hexagonal shaped β and γ phases were grown at different substrate temperatures, respectively. The second-harmonic generation (SHG) measurement confirmed that β has centrosymmetric structure and γ phase has non-centrosymmetric structure. The ferroelectric properties of the γ-In2Se3 were measured along in-plane (IP) and out-of-plane (OOP) directions, for the first time, by employing piezo-force microscope (PFM). The non-monotonic thickness dependence of the ferroelectricity was found and explained with the combination of Raman and SHG measurements. The catalyst-free growth of γ-In2Se3 and the observation of ferroelectricity in it would be a valuable addition in the field of ferroelectric and piezoelectric switching devices.
Persistent Identifierhttp://hdl.handle.net/10722/299266
ISSN
2020 Impact Factor: 5.316
2015 SCImago Journal Rankings: 1.006

 

DC FieldValueLanguage
dc.contributor.authorRASHID, R-
dc.contributor.authorLing, FCC-
dc.contributor.authorWang, SP-
dc.contributor.authorXiao, K-
dc.contributor.authorCui, X-
dc.contributor.authorRAO, Q-
dc.contributor.authorKi, DK-
dc.date.accessioned2021-05-10T06:59:22Z-
dc.date.available2021-05-10T06:59:22Z-
dc.date.issued2021-
dc.identifier.citationJournal of Alloys and Compounds, 2021, v. 870, p. article no. 159344-
dc.identifier.issn0925-8388-
dc.identifier.urihttp://hdl.handle.net/10722/299266-
dc.description.abstractIndium selenide (In2Se3) has got much recent attraction in a variety of research areas mainly due to its multiphase structure. Many existing studies, however, have focused on growth of α and β phase, while chemical vapor deposition (CVD) growth of the γ-phase has only been achieved for micon-thick flakes with the assistance of iodine trichloride (ICl3) catalysts. Here, we present the “catalyst-free” CVD growth of β and γ phase In2Se3 flakes with thicknesses down to only a few nanometers. The structural, optical and ferroelectric properties of the grown samples were investigated carefully by using various techniques. Optical microscope and Raman spectroscopy studies revealed that triangular and hexagonal shaped β and γ phases were grown at different substrate temperatures, respectively. The second-harmonic generation (SHG) measurement confirmed that β has centrosymmetric structure and γ phase has non-centrosymmetric structure. The ferroelectric properties of the γ-In2Se3 were measured along in-plane (IP) and out-of-plane (OOP) directions, for the first time, by employing piezo-force microscope (PFM). The non-monotonic thickness dependence of the ferroelectricity was found and explained with the combination of Raman and SHG measurements. The catalyst-free growth of γ-In2Se3 and the observation of ferroelectricity in it would be a valuable addition in the field of ferroelectric and piezoelectric switching devices.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jallcom-
dc.relation.ispartofJournal of Alloys and Compounds-
dc.subjectγ-In2Se3-
dc.subjectChemical vapour deposition-
dc.subjectFerroelectric response-
dc.subjectRaman spectroscopy-
dc.subjectSecond harmonic generation-
dc.titleIP and OOP ferroelectricity in hexagonal γ-In2Se3 nanoflakes grown by chemical vapor deposition-
dc.typeArticle-
dc.identifier.emailLing, FCC: ccling@hkucc.hku.hk-
dc.identifier.emailXiao, K: kexiao@hku.hk-
dc.identifier.emailCui, X: xdcui@hku.hk-
dc.identifier.emailKi, DK: dkki@hku.hk-
dc.identifier.authorityLing, FCC=rp00747-
dc.identifier.authorityCui, X=rp00689-
dc.identifier.authorityKi, DK=rp02444-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jallcom.2021.159344-
dc.identifier.scopuseid_2-s2.0-85102316623-
dc.identifier.hkuros322370-
dc.identifier.volume870-
dc.identifier.spagearticle no. 159344-
dc.identifier.epagearticle no. 159344-
dc.publisher.placeNetherlands-

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