通过刮涂法将P25粉的乙醇体系配制的TiO_2浆料制备成光阳极中的TiO_2薄膜,在TiO_2浆料中分别加入聚乙烯吡咯烷酮(PVP)和乙基纤维素(M70),作对比实验,研究发现加入PVP制备的TiO_2薄膜的宏观和微观结构都得到了明显的改善,其影响了TiO_2薄膜的孔隙率、比表面积和染料的吸附量,显著改善了染料敏化太阳电池性能,短路电流由5.59 mA/cm~2增到11.31 mA/cm~2,电池效率由2.70%增到5.31%(AM1.5).
TiO_2 pastes were prepared using P25 powders and ethanol systems, which were used to make TiO_2 films as photo anode by the method of doctor blade coating. Comparing poly-vinyl pyrrolidone (PVP) with ethyl cellulose (M70) as film forming agents, it is discovered that the macro-and micro-structure of TiO_2 film using PVP has been improved, which mainly affects TiO_2 films porosities, surface area and dye adsorptions. PVP has played a significant role on the performances of dye-sensitized solar cells. As a result, short-circuit current increased from 5.59 mA/cm~2 to 11.31 mA/cm~2 and conversion efficiency increased from 2.70% to 5.31% under the standard AM1.5 irradiation condition.
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