Designed Architecture of Multiscale Porous TiO2 Nanofibers for Dye-Sensitized Solar Cells Photoanode
2012
Hwang, Sun-Hye | Kim, Chanhoi | Song, Hee | Son, Suim | Jang, Jyongsik
Multiscale porous (MSP) TiO₂ nanofibers (NFs) were fabricated using a simple electrospinning and etching process with TiO₂/SiO₂ composite NFs for high-efficiency dye-sensitized solar cells (DSSCs). TiO₂ NFs with different pore sizes (small, large, and multiscale) were prepared using SiO₂ nanoparticles of various sizes. The surface area of the MSP TiO₂ NFs was nine times higher than that of pristine TiO₂ NFs, providing sufficient dye adsorption for light harvesting as well as efficient paths for electrolyte contact. Moreover, the one-dimensional structure provides efficient light scattering and fast electron transport. As a result, DSSCs exhibited an enhanced current density (Jₛc) of 16.3 mA cm–² and a high photoconversion efficiency (η) of 8.5%, greater than those of conventional photoelectrodes made of TiO₂ nanoparticles (Jₛc of 12.0 mA cm–² and η of 6.0 %).
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