Fabrication And Properties Research On TiO₂Photoanode Of Dye-sensitized Solar Cells

Dye-sensitized solar cell (DSSC) has a good application prospective with lowcost, simple preparation procedure and high photoelectric conversion efficiency. Inthis paper, we discussed the process optimization of TiO2thin films photo-anodeprepared by doctor-blading method and tested photoelectric conversion properties ofzero dimension and one dimension nanomaterial as photo-anode. Electrochemicalimpedance spectroscopy was employed to study transmission and recombination ofelectron in the thin film.The results show that the highest photoelectric conversion efficiency achieved6.27%when the conditions as follows: viscous paste include18wt%TiO2,9wt%EC,73wt%terpilenol, TiCl4treatment,18μm thick, illumination for1min. In order toinvestigate film area impact on the efficiency, Large area TiO2photoanode thin filmsare prepared by spray-coating method. The results show that the larger the film area,the lower the efficiency.Anatase-rutile mixed-crystal N-doped TiO2using tetrabutyl titanate as titaniumsourse and diethanol amine as nitrogen sourse are prepared by sol-gel technique. XRD,SEM, UV-Vis DRS methods are employed to characterized the crystal form, surfacemorphology and visible-light activity.Combined with photocatalyst degradationexperiments of methyl orange, the opimal fabrication conditions are obtained:Ti(OBu)4: DEA: H2O: HAc: EtOH(mole ratio)=1:0.6:2:1:11, with0.24ml HNO3and calcining temperature of550℃. Photoelectric conversion performance test resultsshow that efficiency is up to2.34%and fill factor is0.49.TiO2nanotube arrays were fabricated by using anodization method on a puretitanium foil with the using of NH4F/ethylene glycol as electrolyte solution. The idealnanotube arrays were prepared under the conditions as0.5wt%NH4F,40V oxidevoltage,2h oxide time, ultrasonic treatment in the diluted acid and it’s efficiency is1.17%. Transparent TiO2nanotube arrays films were prepared successfully bytwo-step anodization technique, then mixed with commercial TiO2by ultrasonicdispersion technique.The photoelectric conversion efficiency achieved6.52%because nanotube-nanoparticle mixture improve the transmission efficiency of electron in thethin film.