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2020-04-19Zeitschriftenartikel DOI: 10.18452/21467
Electrode Work Function Reduction by Polyethylenimine Interlayers: Choice of Solvent and Residual Solvent Removal for Superior Functionality
dc.contributor.authorBontapalle, Sujitkumar
dc.contributor.authorOpitz, Andreas
dc.contributor.authorSchlesinger, Raphael
dc.contributor.authorMarder, Seth R.
dc.contributor.authorVarughese, Susy
dc.contributor.authorKoch, Norbert
dc.date.accessioned2020-06-11T09:51:07Z
dc.date.available2020-06-11T09:51:07Z
dc.date.issued2020-04-19none
dc.identifier.other10.1002/admi.202000291
dc.identifier.urihttp://edoc.hu-berlin.de/18452/22210
dc.description.abstractSections PDFPDF Tools Share Abstract Ultrathin polyethylenimine (PEI) interlayers are frequently used to reduce the work function of electrode materials; however, to exploit the full potential of this material for application in optoelectronic devices, further fundamental understanding is required. Here, it is demonstrated that intermixing of PEI deposited from water solution onto the conductive polymer poly(3,4‐ethylene‐dioxythiophene) (PEDOT):polystyrene sulfonate can be avoided by using anhydrous butanol as solvent. At the same time, this choice of solvent prevents de‐doping of PEDOT and preserves the electrode's transparency. For inorganic electrode materials, i.e., ZnO and graphite, it is demonstrated that residual solvent in PEI films, present even after annealing in inert gas atmosphere, leads to significant surface dewetting, and thus inhomogeneity in terms of the morphology and work function. However, annealing in ultrahigh vacuum removes residual solvent, establishes homogenous surface coverage with PEI, and allows one to achieve the maximum work function reduction. For the transparent electron transport material ZnO, a record low work function value of 2.3 eV is achieved, which can enable the formation of ohmic contacts to most semiconductors.eng
dc.language.isoengnone
dc.publisherHumboldt-Universität zu Berlin
dc.rights(CC BY 4.0) Attribution 4.0 Internationalger
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectelectrodeseng
dc.subjectpolyethylenimine interlayerseng
dc.subjectwork functioneng
dc.subject.ddc540 Chemie und zugeordnete Wissenschaftennone
dc.subject.ddc600 Technik und Technologienone
dc.titleElectrode Work Function Reduction by Polyethylenimine Interlayers: Choice of Solvent and Residual Solvent Removal for Superior Functionalitynone
dc.typearticle
dc.identifier.urnurn:nbn:de:kobv:11-110-18452/22210-8
dc.identifier.doihttp://dx.doi.org/10.18452/21467
dc.type.versionpublishedVersionnone
local.edoc.container-titleAdvanced materials interfacesnone
local.edoc.pages6none
local.edoc.type-nameZeitschriftenartikel
local.edoc.institutionMathematisch-Naturwissenschaftliche Fakultätnone
local.edoc.container-typeperiodical
local.edoc.container-type-nameZeitschrift
local.edoc.container-publisher-nameWiley-VCHnone
local.edoc.container-publisher-placeWeinheimnone
local.edoc.container-volume7none
local.edoc.container-issue11none
dc.description.versionPeer Reviewednone
local.edoc.container-articlenumber2000291none
dc.identifier.eissn2196-7350

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