关键词: 二氧化钛膜, 纳米粒子, 太阳能电池, 光电性能

Abstract: The dye sensitized nanocrystalline solar cell is a new type of liquid cell which is based on a photoelectrochemical process.The light absorption is performed by a monolayer of dye (i.e.,a ruthenium complex) that is adsorbed chemically at the surface of a semiconductor (i.e.,titanium oxide (TiO₂)).In this paper, a dye sensitized solar cell is constructed by spreading TiO₂ gel on the conductive glass.TiO₂ gel is prepared by grinding the mixture solution of nanoparticle TiO₂ powder (P25),dispersant acetylacetone and emulsifying agent OP.The porous TiO₂ films are immersed into dye RuL₂(SCN)₂ solution overnight after they have been thermally treated at 400 ℃.Under the irradiation of the xenon lamp (100 W) simulating the solar light,the properties which include the short circuit photocurrent (I_sc),open circuit voltage (V_oc) and the fill factor (ff) of the solar cells are tested.From the parameters of the properties,it is found that the dispersant acetylacetone,emulsification OP,the grinding time and the time of keeping temperature at 400 ℃ great influence on the photoelectric properties of TiO₂ films.It shows that there are higher photoelectric properties which are I_sc 8.85 mA, V_oc 567 mV and ff 0.445 for the solar cell under the condition of dispersant acetylacetone 0.15 mL,emulsifying agent OP 0.10 mL,the grinding time 1 h and the time of keeping temperature 0.5 h.The crystal phase and surface area of TiO₂ films are characterized by X ray diffraction and nitrogen adsorption apparatus respectively.The results show that by the thermal treatment at 400 ℃ the content of anatase is 80% and the surface area of TiO₂ film is about 40 m²/g.

Key words: TiO₂ film, nanoparticle, solar cells, photoelectric properties