Neutral organic redox pairs based on sterically hindered hydroquinone/benzoquinone derivatives for dye-sensitized solar cells
Guardado en:
| Autores: | , , , , |
|---|---|
| Formato: | artículo original |
| Fecha de Publicación: | 2018 |
| Descripción: | 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. |
| País: | Kérwá |
| Institución: | Universidad de Costa Rica |
| Repositorio: | Kérwá |
| OAI Identifier: | oai:kerwa.ucr.ac.cr:10669/76672 |
| Acceso en línea: | https://www.sciencedirect.com/science/article/pii/S0038092X18303256?via%3Dihub#! https://hdl.handle.net/10669/76672 |
| Palabra clave: | Dye-sensitized solar cells Liquid electrolyte Organic redox pair Hydroquinone Benzoquinone 540 Química |