| 초록 |
TiO2/carbon coaxial-structured nanofibers (TCNFs), applied as photoanode in dye-sensitized solar cells (DSSCs), were fabricated by coaxial electrospinning. The precursor of TCNFs was electrospun using polyacrylonitrile in the core and a blend of titanium isopropoxide and polyvinylpyrrolidone in the shell. After calcination at 500 °C for 2 h in air and followed carbonization at 1000 °C for 2 h in nitrogen, the TCNFs were formed with nanocrystalline TiO2 in the shell layer and carbon in the core. The structure and morphology of TCNFs were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The photovoltaic properties of TCNF photoelectrode-based DSSC were investigated using measurements as current density-voltage (J–V) curves, incident photon to converted electron (IPCE), and electrochemical impedance spectroscopy (EIS). The power conversion efficiency (PCE) of TCNF photoelectrode-based DSSC was 7.5 %. |
