Statistical TiO2/dye-mass dependence and dye-regeneration efficiency on dye-sensitized solar cells

Dye-sensitized solar cells (DSCs) were statistically investigated on TiO2 thickness and dye-mass dependence. The DSC devices exhibited a trend of performance saturation from an approximately 15 mu m TiO2 thickness with 10(-7) mol/cm(2) dye-mass, which was estimated to be a maximum engineering condition required for effective charge-transfer kinetics in this investigation. The prominent factor for power conversion efficiency was increase of short-circuit current density by decrease of charge-transfer resistance with a heavy load of dye-mass. The dye-regeneration efficiency evaluated from a minimum electron density and a transferred counterpart ionic carrier density was approximately ranged between 1.5 and 3.0%. (C) 2015 Elsevier Ltd. All rights reserved.