Influence of Electrolyte Concentration on Photovoltaic Performance of DSSCs Based on TiO2 Nanotube Array

Abstract

Abstract. The present work reports a double-layer composite film made of TiO 2 nanotube arrays (TNT-arrays) as the overlayer and TiO 2 nanoparticle (P25) as the underlayer as the photoanode of dye-sensitized solar cells (DSSCs). The TNT-arrays were fabricated by two-step anodization process. In order to further improve the conversion efficiency of DSSCs, TNT-arrays were optimized by changing the anodization conditions. The photoelectric conversion properties of DSSCs with different electrolyte concentration were investigated and compared, and the highest conversion efficiency of 4.20% was achieved in double-layer photoanode at the electrolyte concentration of 0.3wt%.