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Submicrometer-scale ZnO composite aggregate arrays of nanorods and nanoparticles were prepared by simple wet-chemical route and studied as dye-sensitized solar cells(DSSCs)photoanodes.The ZnO composite aggregate arrays significantly improved the efficiency of DSSCs due to their relatively high surface area,fast electron transport,and enhanced light-scattering capability.A short current density(J_(sc))of 11.7 mA/cm~2 and an overall solar-to-electric energy conversion efficiency(η)of 3.17%were achieved for the ZnO composite aggregate DSSCs,which were much higher than those obtained for the monodisperse aggregate DSSCs (J_(sc)=6.9 mA/cm~2,η=1.51%)and ZnO nanorod array DSSCs(J_(sc)=4.2 mA/cm~2,η=0.61%).
Submicrometer-scale ZnO composite aggregate arrays of nanorods and nanoparticles were prepared by simple wet-chemical route and studied as dye-sensitized solar cells (DSSCs) photoanodes. ZnO composite aggregate arrays significantly improved the efficiency of DSSCs due to their relatively high surface area , fast electron transport, and enhanced light-scattering capability. A short current density (J_ (sc)) of 11.7 mA / cm ~ 2 and an overall solar-to-electric energy conversion efficiency ZnO composite aggregate DSSCs, which were much higher than those obtained for the monodisperse aggregate DSSCs (J sc sc = 6.9 mA / cm 2 and η = 1.51%) and ZnO nanorod array DSSCs (J sc sc = 4.2 mA / cm ~ 2, η = 0.61%).