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Single-crystalline Cu2O thin films of optical quality as obtained by the oxidation of single-crystal Cu thin films at low temperature

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dc.contributor.authorTaewoo Ha-
dc.contributor.authorInhee Park-
dc.contributor.authorKyung Ik Sim-
dc.contributor.authorHowon Lee-
dc.contributor.authorJong-Sung Bae-
dc.contributor.authorSu Jae Kim-
dc.contributor.authorJong Phil Kim-
dc.contributor.authorTeun-Teun Kim-
dc.contributor.authorJae Hoon Kim-
dc.contributor.authorJoon Ik Jang-
dc.contributor.authorSe-Young Jeong-
dc.date.available2019-08-19T02:07:06Z-
dc.date.created2019-04-22-
dc.date.issued2019-03-
dc.identifier.issn2166-532X-
dc.identifier.urihttps://pr.ibs.re.kr/handle/8788114/6017-
dc.description.abstractHigh-quality, single-crystal-like Cu2O thin films of various thicknesses (10 nm-45 nm) were prepared at a low temperature (150 degrees C) by controlling layer-by-layer oxidation of wafer-scale Cu thin films sputtered along the (111) direction using a pure single-crystal Cu target. The cross-sectional images of the thin films reveal high crystallinity of Cu2O layers except for 60 degrees twinning in the sequential stacking order as evidenced by high-resolution transmission electron microscopy, which is consistent with the absence of the photoluminescence (PL) signals arising from atomic-scale vacancies. The optical properties of our Cu2O films were investigated using temperature-dependent PL and Raman spectroscopy. All of the Cu2O thin films exhibit characteristic band-to-band transitions together with the series of yellow excitonic transitions slightly below the fundamental bandgap. The spectral locations for the PL are approximately consistent with those for the bulk counterpart. The excellent optical quality of our Cu2O was further demonstrated by significantly reduced quasi-direct transition that occurs at symmetry breaking crystal imperfection, which relaxes the stringent momentum conservation rule. We identified the three main Raman scattering modes of the Cu2O thin films, where the two forbidden modes of Gamma((1))(15) and Gamma(-)(12) + Gamma(-)(25) are resonantly allowed by the proximity of the incident photon energy to the green bandgap. We believe that our synthesis technique can be utilized for the preparation of single-crystal-like metal oxide thin films at low production temperatures with precise thickness control for the development of novel optoelectronic devices and for the exploration of the nanoscale light-matter interaction as well. (C) 2019 Author(s)-
dc.language영어-
dc.publisherAMER INST PHYSICS-
dc.titleSingle-crystalline Cu2O thin films of optical quality as obtained by the oxidation of single-crystal Cu thin films at low temperature-
dc.typeArticle-
dc.type.rimsART-
dc.identifier.wosid000462880800018-
dc.identifier.scopusid2-s2.0-85063526854-
dc.identifier.rimsid67876-
dc.contributor.affiliatedAuthorTaewoo Ha-
dc.contributor.affiliatedAuthorTeun-Teun Kim-
dc.identifier.doi10.1063/1.5087114-
dc.identifier.bibliographicCitationAPL MATERIALS, v.7, no.3, pp.031115-
dc.relation.isPartOfAPL MATERIALS-
dc.citation.titleAPL MATERIALS-
dc.citation.volume7-
dc.citation.number3-
dc.citation.startPage031115-
dc.description.journalClass1-
dc.description.journalClass1-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.relation.journalWebOfScienceCategoryNanoscience & Nanotechnology-
dc.relation.journalWebOfScienceCategoryMaterials Science, Multidisciplinary-
dc.relation.journalWebOfScienceCategoryPhysics, Applied-
dc.subject.keywordPlusCUPROUS-OXIDE FILMS-
dc.subject.keywordPlusRAMAN-SCATTERING-
dc.subject.keywordPlusRESONANCE RAMAN-
dc.subject.keywordPlusEXCITONS-
dc.subject.keywordPlusYELLOW-
dc.subject.keywordPlusABSORPTION-
dc.subject.keywordPlusSPECTRUM-
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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