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dc.contributor.advisorÇelebi, Cemen_US
dc.contributor.authorKalkan, Sırrı Batuhan
dc.date.accessioned2018-04-06T07:45:03Z
dc.date.available2018-04-06T07:45:03Z
dc.date.issued2017-12
dc.identifier.citationKalkan, S. B. (2017). The effect of atmospheric gases on the electrical stability of graphene. Unpublished master's thesis, İzmir Institute of Technology, İzmir, Turkeyen_US
dc.identifier.urihttp://hdl.handle.net/11147/6856
dc.descriptionThesis (Master)--Izmir Institute of Technology, Physics, Izmir, 2017en_US
dc.descriptionIncludes bibliographical references (leaves: 56-58)en_US
dc.descriptionText in English; Abstract: Turkish and Englishen_US
dc.description.abstractIn this thesis, adsorbate induced variations in the electrical conductivity of graphene layers with two different types of charge carriers are investigated experimentally by using Transient Photocurrent Spectroscopy (TPS) method. In-vacuum TPS measurements taken for a duration of 5 ks, revealed that the adsorption/desorption of atmospheric adsorbates leads to a 45 % incerment and 110 % decrement in the conductivity of CVD graphene (p--type) and epitaxial graphene (n-type) layers on semi-insulation (SI) Silicon Carbide (SiC) substrates, respectively. The graphene layers on SI-SiC substrates are encapsulated and passivated with thin SiO2 film grown by Thermal Evaporation and Pulsed Electron Deposition (PED) techniques. The mesurements conducted for short periods and a few cycles showed that the thermal passivation of graphene layers is insufficient. However, the PED encapsulation process completely suppresses the time-dependent conductivity instability of graphene independent of its charge carrier type. The obtained results are used the construct an experimental model for identifying adsorbate related conductivity variations in graphene and also in other 2D materials with inherently high surface-to-volume ratio.en_US
dc.language.isoengen_US
dc.publisherIzmir Institute of Technologyen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectGrapheneen_US
dc.subjectPhotocurrent spectroscopyen_US
dc.subjectElectrical stabilityen_US
dc.subjectAdsorptionen_US
dc.subjectSurfaces and interfacesen_US
dc.titleThe effect of atmospheric gases on the electrical stability of grapheneen_US
dc.title.alternativeAtmosferik gazların grafenin elektriksel kararlığı üzerindeki etkisien_US
dc.typemasterThesisen_US
dc.contributor.departmentIzmir Institute of Technology. Physicsen_US
dc.relation.publicationcategoryTezen_US


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