Size effect of POMs promoting electron transfer to improve the performance of dye-sensitized solar cells
In recent years,dye-sensitized solar cells(DSSCs)have attracted much attention due to their a-bility to efficiently convert light energy into electricity.The enhancement of electron transfer efficiency and the suppression of interfacial charge recombination are essential for the development of DSSCs.Poly-oxometalates(POMs)have already been confirmed to act as effective electron-transfer mediators for accep-ting and delivering electrons remaining the integrated structure.Due to size effect,nano-sized POMs with more active sites,exposed more surface area,and changed electronic structure enhance the inherent activi-ty.Further,the nano-sized POMs aiming on titanium dioxide(TiO2)shortens the electron transport dis-tance,accelerate the electron transfer,and effectively suppresses the electron-hole recombination,thus improving the electron utilization and enhancing the power conversion efficiency(PCE)of the DSSCs.Taking PMo12 as an example,we prepared PMo12 to a nanometer size of about 50 nm by freeze-drying tech-nology and further combined with TiO2 as photoanodes.To our satisfying surprise,a significant improve-ment of PCE in DSSCs is obtained as high as 8.12％,which is 22.3％and 47.3％higher than the original PMo12/TiO2 composite material and TiO2 alone,respectively.
polyoxometalatesdye-sensitized solar cellssize effect
NETL
NSTL
万方数据
