染料敏化太阳能电池的二氧化钛膜性能研究

以二氧化钛(TiO₂)纳米粉(P25)为原料,把它研磨成胶状,用涂敷法制得TiO₂纳米多孔膜,并组装成太阳能电池,用100W氙灯作为模拟太阳光,对电池进行光电性能测试.根据电池的短路电流(I_sc)、开路电压(V_oc)和填充因子(ff)等指标来反映电池的性能.研究表明,分散剂乙酰丙酮、OP乳化剂、研磨时间和热处理后的保温时间长短对TiO₂膜的性能均有很大的影响.其结果是,乙酰丙酮0.15mL、OP乳化剂0.10mL、研磨时间1h和保温时间0.5h时,TiO₂膜的光电性能较好,I_sc、V_oc和ff分别为8.85mA、567mV和0.445.并用XRD和比表面及孔隙分析仪对TiO₂膜进行了表征.

STUDY ON PROPERTIES OF DYE-SENSITIZED TiO2 FILMS

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 (TiO2)).In this paper, a dye sensitized solar cell is constructed by spreading TiO2 gel on the conductive glass.TiO2 gel is prepared by grinding the mixture solution of nanoparticle TiO2 powder (P25),dispersant acetylacetone and emulsifying agent OP.The porous TiO2 films are immersed into dye RuL2(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 TiO2 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 TiO2 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 TiO2 film is about 40 m2/g.