Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/3141
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dc.contributor.advisorOkur, Salihen
dc.contributor.authorYağmurcukardeş, Nesli-
dc.date.accessioned2014-07-22T13:50:57Z-
dc.date.available2014-07-22T13:50:57Z-
dc.date.issued2011en
dc.identifier.urihttp://hdl.handle.net/11147/3141-
dc.descriptionThesis (Master)--Izmir Institute of Technology, Physics, Izmir, 2011en
dc.descriptionIncludes bibliographical references (leaves: 90-101)en
dc.descriptionText in English; Abstract: Turkish and Englishen
dc.descriptionxiv, 101 leavesen
dc.description.abstractThis thesis focuses on to improve OLED characteristics of fabricated devices by modifying the ITO (anode) surface using novel carboxylic acid based molecule 4-[(3-methylphenyl)(phenyl)amino]benzoic acid (MPPBA). In this study, commercial ITO substrates were used as anodes. To modify the ITO surface, etched ITO substrates were kept in 1mM MPPBA-ethanol solution. As a hole transport layer (HTL), N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine (TPD) or N,N'-Di-[(1-naphthyl)-N,N'-diphenyl]-1,1'-biphenyl)-4,4'-diamine (NPB) small molecules were deposited using an organic evaporator system under the vacuum of 10-6 Torr. Finally, as a cathode contact layer, aluminum thin film of 120 nm was deposited on top of the fabricated organic thin film layers. The final structure of the devices was obtained as ITO /SAM (2nm) /HTL (50nm) /Al (120nm). The current-voltage characteristics of devices of unmodified bare ITO and MPPBA modified ITO substrates were analyzed by using the space charge limited current approach and Thermionic Schottky Emission Models. Additionally, surface characterizations of the SAM modified thin films were carried out using Quartz Crystal Microbalance (QCM), Atomic Force Microscopy (AFM), Kelvin Probe Force Microscopy (KPFM), X-ray Photoelectron Spectroscopy (XPS), Cyclic Voltammetry (CV) and Ultraviolet-visible Absorption Spectroscopy (UV-Vis) techniques. The obtained results reveal that the modification of the ITO surface with MPPBA molecules reduces the barrier height difference between the Fermi level of the anode and HOMO level of the HTL. Hence the hole injection increases while the turn-on voltage decreases. As a result of this process OLED characteristics were improved by using the MPPBA SAM molecules.en
dc.language.isoenen_US
dc.publisherIzmir Institute of Technologyen
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subject.lcshLight emitting diodesen
dc.subject.lcshOrganic electronicsen
dc.subject.lcshThin filmsen
dc.subject.lcshMetal oxide semiconductorsen
dc.titleCharacterization of modified ito anode surfaces with 4 [3-methylphenyl) phenyl) anino] benzoic acid for oled applicationsen_US
dc.typeMaster Thesisen_US
dc.institutionauthorYağmurcukardeş, Nesli-
dc.departmentThesis (Master)--İzmir Institute of Technology, Physicsen_US
dc.relation.publicationcategoryTezen_US
item.openairetypeMaster Thesis-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
item.languageiso639-1en-
item.cerifentitytypePublications-
item.grantfulltextopen-
Appears in Collections:Master Degree / Yüksek Lisans Tezleri
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