Binary Redox Couples for Highly Transparent and High-Voltage Dye-Sensitized Solar Cells

The conventional iodine-based (I − /I 3 ) electrolyte used in dye-sensitized solar cells (DSSCs) presents several limitations, such as ∼30% absorption of visible light the wavelength range 300–500 nm and a large potential difference between Fermi level I HOMO dye. This has negative impact on characteristics DSSC transparency open circuit voltage (V oc ). In present work, series transparent electrolytes are prepared using various additives 2 , LiI, guanidine thiocyanate/guanidine nitrate (GuSCN/GuNO ), Br to obtain highly high DSSCs. results demonstrate that usage optimized consisting 0.003 M 0.01 0.1 GuNO with binary redox couple )/(I contributes an ∼25% increase transmittance compared electrolyte, while concentration is significantly reduced. Furthermore, downward shift system shown provide ∼100 mV enhancement V based DSSC. addition, devices achieve power conversion efficiency ∼7.94% which closely comparable performance electrolyte-based Thus, study could immense insights toward fabrication high-voltage DSSCs for application photovoltaic windows. by operative under 2000 lux compact fluorescent lamp (CFL) were also successfully fabricated yielded promising 23.6%.