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dc.contributor.authorEtxebarria, Ikerne
dc.contributor.authorGuerrero, Antonio
dc.contributor.authorAlbero, Josep
dc.contributor.authorGarcia-Belmonte, Germà
dc.contributor.authorPalomares, Emilio
dc.contributor.authorPacios, Roberto
dc.date.accessioned2015-06-23T18:27:04Z
dc.date.available2015-06-23T18:27:04Z
dc.date.issued2014
dc.identifier.issn1566-1199
dc.identifier.issn1878-5530
dc.identifier.urihttp://hdl.handle.net/10234/125044
dc.description.abstractIn this work we compare the photovoltaic performance of different cell designs, standard and inverted, for one of the most promising systems to achieve power conversion efficiencies over 10% in polymer:fullerene single cells, namely PTB7:PC70BM. Impedance spectroscopy, charge extraction and transient photovoltage are used in order to assign the electrical losses initially observed in the current density–voltage curve and understand the main limitation of every design. While inverted devices show competitive performance in terms of charge generation, transport of carriers and also for charge collection at electrodes, standard devices present additional resistive losses that are assigned to charge transfer issues at the active layer/anode interface. This additional resistance increase the overall series resistance of devices, lowers the fill factor and it is the ultimate responsible for the observed reduced device performance of standard cells in comparison to inverted ones. In this way, devices over 7.2% are reported with ZnO and MoO3 as interlayer electrodes that act as improved highly selective and extracting contacts in comparison to standard PEDOT:PSS and Ca/Ag. Contacts are thus electrically optimized. Additional improvement of device performance must consider enhancement of intrinsic recombination properties of the blend. Lower molecular weights and/or any residual catalyst impurities with respect to other batches are the only limitation to reach record efficiencies as those shown in recent works.ca_CA
dc.format.extent19 p.ca_CA
dc.format.mimetypeapplication/pdfca_CA
dc.language.isoengca_CA
dc.publisherElsevierca_CA
dc.relation.isPartOfOrganic Electronics 15 (2014) 2756–2762ca_CA
dc.rights© 2014 Elsevier B.V. All rights reservedca_CA
dc.subjectInverted organic solar devicesca_CA
dc.subjectSelective contactsca_CA
dc.subjectResistive and capacitance lossesca_CA
dc.titleInverted vs Standard PTB7:PC70BM Organic Photovoltaic Devices. The benefit of highly selective and extracting contacts in device performanceca_CA
dc.typeinfo:eu-repo/semantics/articleca_CA
dc.identifier.doihttp://dx.doi.org/10.1016/j.orgel.2014.08.008
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessca_CA
dc.relation.publisherVersionhttp://www.sciencedirect.com/science/article/pii/S1566119914003267#ca_CA


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