Akademik Veri Yönetim Sistemi
Transition Metal Chemistry, cilt.43, sa.3, ss.279-284, 2018 (SCI-Expanded, Scopus)
Abstract: The development of redox shuttles containing electrolytes is very important for obtaining efficient dye-sensitized solar cells (DSSCs). We have therefore synthesized and characterized homoleptic [Co(dafo)3]3+/2+ complexes (dafo = 4,5-diazafluoren-9-one) and studied the effect of the redox diffusion coefficient on the photovoltaic performance of their DSSCs. The compounds were characterized by FTIR, UV–Vis spectroscopy, NMR and MS spectroscopic data. The [Co(dafo)3]2+/3+ system has been used to formulate redox-mediator electrolytes for application in DSSC devices with the N719 ruthenium-polypyridyl dye, TiO2 and CdS sensitizer. This system shows a slightly higher power-conversion efficiency (η = 0.30%) in a DSSC device prepared with a CdS/Pt electrode. Although the [Co(dafo)3]3+/2+ electrolyte shows a moderately high open-circuit potential (Voc = 0.58), it suffers from a reduced short-circuit current (Jcs = 2.04). The data suggest a decreased turnover of the CoIII/II redox couple at the Pt counter electrode for the [Co(dafo)3]3+/2+ system, concomitant with an increased resistance to mass-transfer diffusion. Graphical Abstract: [Figure not available: see fulltext.].