Imaging Science and Photochemistry ›› 2003, Vol. 21 ›› Issue (3): 231-237.DOI: 10.7517/j.issn.1674-0475.2003.03.231

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STUDY ON PROPERTIES OF DYE-SENSITIZED TiO2 FILMS

FAN Le-qing, WU Ji-huai, HUANG Yun-fang, LIN Jian-ming   

  1. College of Materials Science and Engineering, Huaqiao University, Quanzhou 362011, Fujian, P.R.China
  • Received:2003-02-17 Revised:2003-03-05 Online:2003-05-23 Published:2003-05-23

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 (Isc),open circuit voltage (Voc) 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 Isc 8.85 mA, Voc 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

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