Citation: GUO Wei, WANG Kai, SHEN Yi-Hua, ZHANG He, WENG Tao, MA Ting-Li. A Simple Template Synthesis of Hierarchically Mesoporous TiO2 Microsphere for Dye-Sensitized Solar Cells[J]. Acta Physico-Chimica Sinica, ;2013, 29(01): 82-88. doi: 10.3866/PKU.WHXB201211071
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Mesoporous TiO2 microspheres were synthesized using a simple template method. The effect of the alkyl chain length on the synthesis and properties of the TiO2 microspheres was studied. A high power conversion efficiency (9.5%-10.1%) was attained by the dye-sensitized solar cells (DSCs) fabricated with the hierarchically mesoporous TiO2 microsphere films. The physical properties of the TiO2 microspheres were analyzed by X-ray diffraction (XRD), N2 physisorption (BET), and scanning electron microscopy (SEM). The results indicated the TiO2microsphere crystal structure to be in the pure anatase phase; the rough surface microstructure of the TiO2 microspheres, formed through accumulation of nanocrystalline (14-18 nm diameter) TiO2 particles, provides a proper large surface area and mesoporous structure. The hierarchically mesoporous TiO2 microspheres can form od paths for mass transport, and also act as light scattering layers for efficient light harvesting. Meanwhile, the rough TiO2 microsphere surface ensures a sufficient amount of dye uptake, and consequently improves the photo-generated electron density. Electrochemical impedance analysis demonstrated the advantage of using microspheres for mass transport in electrolytes.
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