| 초록 |
Large surface area for dye adsorption and big pores for electrolyte transport are very important factors in photoanode of dye-sensitized solar cells (DSSCs), in particular, employing solid polymer electrolyte. We present a new synthetic approach, via a two step method: first hydrolysis reaction of precursors at room temperature to make particles with approximately 200 nm in size and subsequent solvothermal treatment in ethanol at 260oC for 6 hrs. This structure exhibited a unique morphology and demonstrated a significantly improved photovoltaic performance. Electron microscopy images revealed bumpy surface, indicating larger surface area for dye adsorption, compared to that of the un-treated particle. As a result, bimodal pores were successfully formed in the TiO2 layer. Consequently, it showed an increase of power conversion efficiency of DSSCs on account of the efficient penetration of polymer electrolyte through large pores and the increased amount of dye adsorption. |
