The Controllable Synthesis Of Chain-like TiO₂Networks Nanostructures And Application In Dye-sensitized Solar Cells

This thesis describes the principles, characteristics, and conversion efficiency of variouskinds of solar cells. Chain-like TiO₂nanomaterials were fabricated by a simple method, andtheir photovoltaic performances were investigated.In this thesis， multi-walled carbon nanotube（MWCNT）/TiO₂core-shell nanostructureswith different shell thickness were synthetized by a simple wet-chemical method. Afteranneling in air, a new type of TiO₂nanostructures, chain-like TiO₂networks nanostructure,was obtained. The length of the chain-like TiO₂nanostructures can be easily controled bychanging the experimental condition.The solar cell which consists of a working electrode (chain-like TiO₂nanostructuresdeposited on ITO and a counter electrode （Pt films on ITO） was assembled completely.photovoltaic performances were measured and the electrochemical impedances were analyzed.DSSC based on long chain-like TiO₂photoelectrode exhibits a conversion efficiency of6.23%, whereas the conversion efficiencies of DSSC based on short chain like TiO₂based andconventional P25nanoparticulate under the same conditions are5.13%and6.05%,respectively. Higher photovoltaic conversion efficiency of long chain-like TiO₂nanostructuresimplys they can be used electrodes of solar cell.