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Electrochemical impedance spectroscopy for study of electronic structure in disordered organic semiconductors - Possibilities and limitations

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dc.title Electrochemical impedance spectroscopy for study of electronic structure in disordered organic semiconductors - Possibilities and limitations en
dc.contributor.author Schauer, František
dc.contributor.author Nádaždy, Vojtech
dc.contributor.author Gmucová, Katarína
dc.relation.ispartof Journal of Applied Physics
dc.identifier.issn 0021-8979 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2018
utb.relation.volume 123
utb.relation.issue 16
dc.type article
dc.language.iso en
dc.publisher American Institute of Physics Inc.
dc.identifier.doi 10.1063/1.5008830
dc.relation.uri https://aip.scitation.org/doi/full/10.1063/1.5008830
dc.description.abstract There is potential in applying conjugated polymers in novel organic optoelectronic devices, where a comprehensive understanding of the fundamental processes and energetics involved during transport and recombination is still lacking, limiting further device optimization. The electronic transport modeling and its optimization need the energy distribution of transport and defect states, expressed by the energy distribution of the Density of States (DOS) function, as input/comparative parameters. We present the Energy Resolved-Electrochemical Impedance Spectroscopy (ER-EIS) method for the study of transport and defect electronic states in organic materials. The method allows mapping over unprecedentedly wide energy and DOS ranges. The ER-EIS spectroscopic method is based on the small signal interaction between the surface of the organic film and the liquid electrolyte containing reduction-oxidation (redox) species, which is similar to the extraction of an electron by an acceptor and capture of an electron by a donor at a semiconductor surface. The desired DOS of electronic transport and defect states can be derived directly from the measured redox response signal to the small voltage perturbation at the instantaneous position of the Fermi energy, given by the externally applied voltage. The theory of the ER-EIS method and conditions for its validity for solid polymers are presented in detail. We choose four case studies on poly(3-hexylthiophene-2,5-diyl) and poly[methyl(phenyl)silane] to show the possibilities of the method to investigate the electronic structure expressed by DOS of polymers with a high resolution of about 6 orders of magnitude and in a wide energy range of 6 eV. © 2018 Author(s). en
utb.faculty Faculty of Applied Informatics
dc.identifier.uri http://hdl.handle.net/10563/1007778
utb.identifier.obdid 43879283
utb.identifier.scopus 2-s2.0-85041805313
utb.identifier.wok 000431147200120
utb.identifier.coden JAPIA
utb.source j-scopus
dc.date.accessioned 2018-04-23T15:01:43Z
dc.date.available 2018-04-23T15:01:43Z
dc.description.sponsorship Slovak Research and Development Agency [APVV-0096-11]; Scientific Grant Agency VEGA [1/0501/15, 2/0163/17]; Research and Development Operational Program - ERDF under the ASFEU project Centre for Applied Research of Advanced Photovoltaic Cells, ITMS [26240220047]
utb.contributor.internalauthor Schauer, František
utb.scopus.affiliation Faculty of Applied Informatics, Tomas Bata University in Zlín, Zlín, Czech Republic; Institute of Physics SAS, Dúbravská cesta 9, Bratislava, Slovakia
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