Optical and electrochemical properties of polyether derivatives of perylenediimides adsorbed on nanocrystalline metal oxide films

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dc.contributor.authorKus M.
dc.contributor.authorHakli O.
dc.contributor.authorZafer C.
dc.contributor.authorVarlikli C.
dc.contributor.authorDemic S.
dc.contributor.authorÖzçelik S.
dc.contributor.authorIcli S.
dc.date.accessioned2024-07-22T08:22:32Z
dc.date.available2024-07-22T08:22:32Z
dc.date.issued2008
dc.description.abstractWe report optical and electrochemical properties of polyether derivatives of perylenediimides (PDIs) thin films formed in various materials (semiconductor, insulator, amorphous and self-assembly). Perylenediimides adsorbed on nanocrystalline TiO2 (NT) nanocrystalline alumina (NA), amorphous silicon (PS) and neat self-assemblied (SA) films were prepared and characterized based on spectroscopic, electrochemical, spectro-electrochemical techniques. The absorption and fluorescence spectra of PDIs in chloroform exhibit vibronic features. The fluorescence quantum yields (Φf) of PDIs with end amino substituents in chloroform solutions are over 0.95, while the quantum yield of triethoxyphenyl substituted PDI Φf value is 0.024 in solution. Optical spectroscopy proves that PDIs in metal oxide thin films form aggregated type complexes. An electrochromism, a color change from red to blue/violet, is observed on metal oxide films, that indicates existence of mono and dianion forms of PDIs. Reversibility of electrochemical reductions in NT film depends on the scanning rate. However, electrochromism in NA films is stable and reversibility is independent from scanning rate. Stable mono and diaionic species are formed on NA films. SA films show broad absorption peaks during the voltammetric scan. On the other hand, the first reduction onset potentials of PDIs are almost equal to the onset potential of capacitive current of TiO2 which lead to low efficiency in dye-sensitized solar cells. © 2008 Elsevier B.V. All rights reserved.
dc.identifier.DOI-ID10.1016/j.orgel.2008.05.009
dc.identifier.issn15661199
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/19126
dc.language.isoEnglish
dc.publisherElsevier
dc.rightsAll Open Access; Green Open Access
dc.subjectAlumina
dc.subjectAluminum oxide
dc.subjectAmorphous films
dc.subjectAmorphous materials
dc.subjectAmorphous silicon
dc.subjectChlorine compounds
dc.subjectDye-sensitized solar cells
dc.subjectElectrochemical properties
dc.subjectElectrochromism
dc.subjectElectrolytic reduction
dc.subjectEthers
dc.subjectFluorescence
dc.subjectMetals
dc.subjectNanocrystalline silicon
dc.subjectNanocrystals
dc.subjectOrganic polymers
dc.subjectQuantum yield
dc.subjectSelf assembly
dc.subjectSemiconductor doping
dc.subjectThin films
dc.subjectTitanium dioxide
dc.subjectAbsorption and fluorescence spectra
dc.subjectElectrochemical reductions
dc.subjectElectrochemical techniques
dc.subjectFluorescence quantum yield
dc.subjectMetal oxide film
dc.subjectN-doping material
dc.subjectNanocrystalline aluminas
dc.subjectPerylenediimides
dc.subjectOxide films
dc.titleOptical and electrochemical properties of polyether derivatives of perylenediimides adsorbed on nanocrystalline metal oxide films
dc.typeArticle

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