文章信息

【作者】：Peilu Zhao,a Pengfei Cheng,b Biao Wang,c Shiting Yao,a Peng Sun,a Fengmin Liu,*a Jie Zhenga and Geyu Lu*a
【题目】：Bilayered photoanode from rutile TiO2 nanorods and hierarchical anatase TiO2 hollow spheres: a candidate for enhanced efficiency dye sensitized solar cells
【关键词】：SCATTERING LAYER, NANOWIRE ARRAYS, PHOTOVOLTAIC PERFORMANCE,NANOTUBE ARRAYS,LOW-COST,MICROSPHERES,NANOPARTICLES,TEMPERATURE, MORPHOLOGY,GROWTH
【版面信息】：RSC Advances 4 (2014) 64737-64743

A bilayered photoanode for dye-sensitized solar cells (DSSCs) was constructed with the top layer using TiO₂ hierarchical hollow spheres (THS) and the second layer based on 3D TiO₂ nanorods. The anatase THS with diameters of 400-600 nm and with a specific surface area of 100.3 m² g^-1 were synthesized via a simple hydrothermal method. As a light scattering layer, the THS could provide dual-functions of adsorbing dye molecules and strong light-harvesting efficiency. The 3D TiO₂ nanorods consisting of 1D vertically aligned rutile TiO₂ nanorods (TNR) and 3D TiO₂ nanoflowers (TNF) were synthesized by a one-step hydrothermal method. The unique 3D nanostructure could offer a better light scattering capability, faster electron transport and lower electron recombination. Consequentially, the bilayered cell exhibited a much higher short-circuit photocurrent density of 15.60 mA cm^-2 and energy conversion efficiency of 7.50%, which indicated a 108.6% and a 36.8% increment of cell efficiency compared to the TNR-F electrode (7.36 mA cm^-2, 3.60%) and THS electrode (13.20 mA cm^-2, 5.48%), respectively.