| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 101 === Titanium (Ti) foil was selected as a photoanode substrate for dye-sensitized solar cell (DSSC). Pretreatment of H2O2 (hydrogen peroxide) etching of Ti results in the formation of porous TiO2 nanostructure on the Ti surface. The porous nanostructure enhances the electrical contact between subsequent screen-printed TiO2 mesoporous film and Ti substrate due to large surface area. Electron collection and transport are improved, resulting in high short-circuit current density (JSC) and thereby improving the power conversion efficiency of DSSC.
In this study, we find that by soaking the H2O2-treated Ti foil in the NaOH (sodium hydroxide) solution in Teflon-lined stainless steel autoclave device at high temperature, the porous TiO2 nanostructure can be removed, exposing the underlying TiO2 nanoparticle layer. The electron diffusion length (Ln) and electron diffusion coefficient (Dn) are improved by this compact TiO2 nanoparticle layer. The charge recombination reaction is suppressed, facilitating the electron injection into the conducting layer of substrate. The JSC and fill factor (FF) are improved and accordingly the power conversion efficiency of DSSC is improved.
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