Abstract
Polyoxometalates have been proved to be the significant electronic transfer medium to improve the power conversion efficiency of dye-sensitized solar cells based on our previous works. However, the morphology of polyoxometalates dramatically affects the photovoltaic performance of dye-sensitized solar cells. In this work, we develop a strategy of utilizing hollow polyoxometalate nanocrystals to improve the efficiency of dye-sensitized solar cells. The hollow polyoxometalate nanocrystals and rhombic dodecahedral polyoxometalate nanocrystals are synthesized and then composited with TiO2 to obtain two kinds of high dispersed polyoxometalate nanocrystals composites. The images of transmission electron microscopy and element mappings confirm that hollow polyoxometalate nanocrystals and rhombic dodecahedral polyoxometalate nanocrystals are uniformly distributed in TiO2 composites. The improved morphology with well-defined structures may provide more active sites for polyoxometalates to achieve faster charge separations and less charge recombinations in dye-sensitized solar cells. In addition, the films with hollow polyoxometalate nanocrystals have better dye loading than those with pristine TiO2. Finally, the dye-sensitized solar cells based hollow polyoxometalate nanocrystals and rhombic dodecahedral polyoxometalate nanocrystals exhibit the efficiency of 8.06% and 7.28%, respectively, which are 34% and 21% higher than those based pristine TiO2 (6.00%).
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
