Fast-Response Single-Nanowire Photodetector Based on ZnO/WS2 Core/Shell Heterostructures

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dc.contributor.authorButanovs, Edgars
dc.contributor.authorVlassov, Sergei
dc.contributor.authorKuzmin, Alexei
dc.contributor.authorPiskunov, Sergei
dc.contributor.authorButikova, Jelena
dc.contributor.authorPolyakov, Boris
dc.date.accessioned2020-08-19T17:44:58Z
dc.date.available2020-08-19T17:44:58Z
dc.date.issued2018
dc.descriptionThis work was supported by the Latvian National Research Program IMIS2 and ISSP project for Students and Young Researchers Nr. SJZ/2016/6. S.P. is grateful to the ERA.Net RUS Plus WATERSPLIT project no. 237 for the financial support. S.V. is grateful for partial support by the Estonian Science Foundation grant PUT1689.en_US
dc.description.abstractThe surface plays an exceptionally important role in nanoscale materials, exerting a strong influence on their properties. Consequently, even a very thin coating can greatly improve the optoelectronic properties of nanostructures by modifying the light absorption and spatial distribution of charge carriers. To use these advantages, 1D/1D heterostructures of ZnO/WS2 core/shell nanowires with a-few-layers-thick WS2 shell were fabricated. These heterostructures were thoroughly characterized by scanning and transmission electron microscopy, X-ray diffraction, and Raman spectroscopy. Then, a single-nanowire photoresistive device was assembled by mechanically positioning ZnO/WS2 core/shell nanowires onto gold electrodes inside a scanning electron microscope. The results show that a few layers of WS2 significantly enhance the photosensitivity in the short wavelength range and drastically (almost 2 orders of magnitude) improve the photoresponse time of pure ZnO nanowires. The fast response time of ZnO/WS2 core/shell nanowire was explained by electrons and holes sinking from ZnO nanowire into WS2 shell, which serves as a charge carrier channel in the ZnO/WS2 heterostructure. First-principles calculations suggest that the interface layer i-WS2, bridging ZnO nanowire surface and WS2 shell, might play a role of energy barrier, preventing the backward diffusion of charge carriers into ZnO nanowire.en_US
dc.description.sponsorshipIMIS; Institute of Solid State Physics, Chinese Academy of Sciences; Eesti Teadusfondi PUT1689; Rural Utilities Service 237; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART²en_US
dc.identifier.doi10.1021/acsami.8b02241
dc.identifier.issn1944-8244
dc.identifier.urihttps://dspace.lu.lv/dspace/handle/7/52431
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/739508/EU/Centre of Advanced Material Research and Technology Transfer/CAMART²en_US
dc.relation.ispartofseriesACS Applied Materials and Interfaces;10 (16)
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectResearch Subject Categories::NATURAL SCIENCES:Physicsen_US
dc.subject1D/1D heterostructuresen_US
dc.subjectcore/shell nanowiresen_US
dc.subjectphotodetectorsen_US
dc.subjecttransitional metal chalcogenidesen_US
dc.subjectvan der Waals epitaxyen_US
dc.titleFast-Response Single-Nanowire Photodetector Based on ZnO/WS2 Core/Shell Heterostructuresen_US
dc.typeinfo:eu-repo/semantics/articleen_US
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