Abstract
Considering the light-harvesting ability, thermal stability and low-cost, phthalocyanines have become suitable candidates used as dye sensitizers in DSSC. Here we fabricate a new type of phthalocyanine-sensitized solar cells with polyoxometalate-modified TiO2photoanode. Based on the PW12/TiO2(H3PW12O40, denoted as PW12) composite photoanode, the overall power conversion efficiency of the cell was improved obviously; this is mainly attributed to the increased electron transport and the reduced charge recombination in the cells, which has been revealed by electrochemical impedance spectroscopy and open-circuit voltage decay measurements. These results obtained in this work show that incorporating polyoxometalates into TiO2 photoanodes can effectively improve the photovoltaic performance of phthalocyanine-sensitized solar cell, although the simple phthalocyanine sensitizer used is not of high efficiency. Thus this work provide a promising strategy to promote the photovoltaic performance of phthalocyanine-sensitized solar cell by modifying TiO2 photoanode with polyoxometalate.
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