Neutral organic redox pairs based on sterically hindered hydroquinone/benzoquinone derivatives for dye-sensitized solar cells

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dc.creatorFlores Díaz, Natalie
dc.creatorSoto Navarro, Andrea
dc.creatorFreitag, Marina
dc.creatorLamoureux Lamontagne, Guy
dc.creatorPineda Cedeño, Leslie William
dc.date.accessioned2019-03-06T16:36:20Z
dc.date.available2019-03-06T16:36:20Z
dc.date.issued2018-06
dc.date.updated2018-12-13T00:42:43Z
dc.description.abstractSubstituted derivatives of hydroquinone/benzoquinone were studied as organic redox mediators in the electrolyte for dye-sensitized solar cells (DSSCs). Thus, di-tert-butylhydroquinone (DTHQ), thymohydroquinone (ThymHQ) and phenylhydroquinone (PhHQ), were combined with their oxidized counterparts to form the pairs DTHQ/DTBQ, ThymHQ/ThymBQ, and PhHQ/PhBQ. In general, the characteristic parameters of the DSSCs with the substituted derivatives surpassed those of the DSSC with the unsubstituted hydroquinone/benzoquinone electrolyte. The short-circuit current (JSC) of the devices using DTHQ/DTBQ and ThymHQ/ThymBQ (13.61 mA cm−2 and 12.56 mA cm−2, respectively) are comparable to the JSC obtained for cobalt(II/III) tris(bipyridine) as a reference electrolyte (14.54 mA cm−2). However, parameters such as open-circuit voltage (VOC) and fill factor (FF) (547 mV and 0.48, respectively) are far from competitive. The best photovoltaic performance was obtained for the pair ThymHQ/ThymBQ using a triphenylamine (TPA)-based organic dye (LEG4) as sensitizer and a hybrid counter electrode with poly(3,4-ethylenedioxythiophene) (PEDOT) and graphene. These experimental conditions give under 1 sun (98%) the highest efficiency (η = 3.19%); low-light intensities of 12.3% and 51.8% suns lead to efficiencies of 3.34% and 3.29%, respectively. Electrochemical impedance spectroscopy (EIS) revealed that the main cause for loss in photocurrent is the low recombination resistance compared to Co(II/III) as reference electrolyte. Based on the EIS analysis, a down-shift of the conduction band of TiO2 was found for all assembled devices containing the organic redox mediators, which explains the low VOC values for these derivatives.es_ES
dc.description.procedenceUCR::Vicerrectoría de Docencia::Ciencias Básicas::Facultad de Ciencias::Escuela de Químicaes_ES
dc.description.procedenceUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Electroquímica y Energía Química (CELEQ)es_ES
dc.description.procedenceUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigaciones en Productos Naturales (CIPRONA)es_ES
dc.description.sponsorshipUniversidad de Costa Rica/[804-B5-271]7UCR/Costa Ricaes_ES
dc.identifier.citationhttps://www.sciencedirect.com/science/article/pii/S0038092X18303256?via%3Dihub#!
dc.identifier.codproyecto804-B5-271
dc.identifier.doi10.1016/j.solener.2018.03.084
dc.identifier.issn0038-092X
dc.identifier.urihttps://hdl.handle.net/10669/76672
dc.language.isoen_USes_ES
dc.relation.ispartof
dc.rightsacceso abierto
dc.sourceSolar Energy, vol. 167, pp. 76-83es_ES
dc.subjectDye-sensitized solar cellses_ES
dc.subjectLiquid electrolytees_ES
dc.subjectOrganic redox paires_ES
dc.subjectHydroquinonees_ES
dc.subjectBenzoquinonees_ES
dc.subject540 Químicaes_ES
dc.titleNeutral organic redox pairs based on sterically hindered hydroquinone/benzoquinone derivatives for dye-sensitized solar cellses_ES
dc.typeartículo original

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