Dye-sensitized Solar Cells Based on TiO2 Nanotube/Nanoparticle Composite as Photoanode and Cu2SnSe3 as Counter Electrode

Dye-sensitized solar cells (DSSCs) based on TiO2 nanotube/nanoparticle (NT/NP) photoanodes and Cu2SnSe3 (CTSe) counter electrodes were fabricated. The effect of the thickness of the CTSe films on the DSSC performance was investigated. It was found that DSSC efficiencies firstly increased and then decreased with increasing the film thickness. The optimized DSSC efficiency of 3.14% was achieved at a suitable film thickness (2.9 μm). This work presents a new approach for developing low-cost alternative for expensive Pt in TiO2-nanotube-based DSSCs.