| 초록 |
Multiscale porous (MSP) TiO2 nanofibers (NFs) are fabricated by a simple electrospinning and etching process with TiO2/SiO2 composite NFs to increase power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs). TiO2 NFs with different pore structure (small, large, and multiscale) were introduced controlling the sizes of SiO2 nanoparticles (NPs). The surface area of the MSP TiO2 NFs exhibited nine times higher than that of pure TiO2 NFs, providing enhanced light scattering effect, sufficient dye absorption on for light harvesting, and efficient electrolyte contact. As a result, the MSP NFs based DSSCs exhibited an increased current density (Jsc) of 16.3 mA cm−2 and a high PCE (η) of 8.5%, greater than those of only TiO2 NPs based DSSCs (Jsc of 12.0 mA cm−2 and η of 6.0 %). |
