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Study on Photoelectric Properties of Composite Films of Graphene/TiO_2 Nanorods

JIN Li-guo;WANG Chao;LIU Tai-yang;ZHAO Hai-lin;School of Material Science & Engineering,Harbin University of Science and Technology;  
TiO_2 nanorods have large specific surface area and the ability of directional transmission electron,based on which can reduce recombination probability of light-generated electrons and holes,and improve the photoelectric conversion efficiency of DSSC.As graphene has low resistivity,good stability and excellent transparency,it can be introduced into anode film to improve the electronic transmission.The TiO_2 nanorods were prepared by hydrothermal method,mixed with different quality of graphene.Its length range was 200-300 nm,with a diameter of about 20 nm.The porous graphene/TiO_2 nanorods composite film were prepared by using electrohydrodynamic technique(EHD) and compositing TiO_2 nanorods with different quality of grapheme.The photoelectric conversion efficiency of the DSSC device prepared with the photo-anode film with graphene mass content of 3% was 4.23%,the photoelectric conversion efficiency increased by 36%,relative to that of no graphene doped TiO_2 nanorods photo-anode film.
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