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

Lookup NU author(s): Professor Marina FreitagORCiD

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Abstract

© 2018 Elsevier Ltd Substituted 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.

Publication metadata

Author(s): Flores-Diaz N, Soto-Navarro A, Freitag M, Lamoureux G, Pineda LW

Publication type: Article

Publication status: Published

Journal: Solar Energy

Year: 2018

Volume: 167

Pages: 76-83

Print publication date: 01/06/2018

Online publication date: 06/04/2018

Acceptance date: 30/03/2018

ISSN (print): 0038-092X

ISSN (electronic): 1471-1257

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.solener.2018.03.084

DOI: 10.1016/j.solener.2018.03.084

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