Preparation And Properties Of Rare Earth Doped Films Conversion DSSC Photoanode

In the dye-sensitized solar cell（DSSC）electrodes study,N3 and N719 dyes are commonly used to sensitized them.However,as sensitized electrode absorb the visible light efficiency,and little ultraviolet light or infrared light.The rare-earth doped luminescent materials can convert ultraviolet light which can’t be absorbed by DSSC to visible light.The instruction of conversion luminescent materials can broade spectral response range of DSSC and improve light utilization efficiency,thereby the optical and electrical properties are improved.The anatase TiO₂ with high photocatalytic activity and a wide band gap,has been widely used in DSSC.In this paper,rare-earth doped TiO₂ nanocrystals were synthesized,and the down-conversion photoanode were prepared with the as-prepared rare-earth doped TiO₂ powders,which was introduced into the dye-sensitized solar cell.The main achievements are as follows:（1）Eu³⁺-doped TiO₂ nanocrystals synthesized by the sol-gel method were introduced into a dye-sensitized solar cell（DSSC）.Photovoltaic properties were investigated based on Eu³⁺ doped TiO₂ prepared by doping different content of Eu.The photovoltaic performances showed that short circuit currents based on a TiO₂:Eu³⁺ photoanode doped with an Eu molar content of 1.5% reached 12.78 m A/cm2,12.69% improved compared to that of a cell without adown-conversion photoanode,and the efficiency was also increased by 11.44 %.（2）Sm³⁺-doped TiO₂ nanocrystals with afixed content were synthesized by the sol-hydrothermal method and the down-conversions positive glow were prepared with the matrix of P25 doped with different mass fraction of the as-prepared TiO₂:Sm³⁺ powder,which was used to assemble the dye-sensitized solar cell（DSSC）to improve the photoelectric properties.Photovoltaic properties were investigated,when the doped content of the as-prepared TiO₂:Sm³⁺ powder in the photo anode was 80 wt%,the short circuit current density reached to 13.12 m A/cm2,increased by 26.5% compared with the pure P25 photoanode,and the efficiency was also increased by 23.5 %.（3）A downconversion photoelectrode of TiO₂:Sm³⁺ nanocrystals synthesized by hydrothermal method was introduced into dye-sensitized solar cells.Photovoltaic properties of the new DSSC with different content of samarium were studied to investigate the effect of DC nanocrystals in DSSC.The photoelectric performances show that the short-circuit current density of DSSCs based on a TiO₂:Sm³⁺ photoanode synthesized with 1mol% doping of samarium reached 16.74 m A/cm2,approximately 25.07% enhancement as compared to that of a cell based on a pure TiO₂ photoelectrode.The photoelectric conversion efficiency of the DSSC was also increased by 16.7%.（4）Eu,Sm-codoped TiO₂ nanocrystals were synthesized by the sol-gel method,and the down-conversion photoanode were prepared with the as-prepared Eu,Sm-codoped TiO₂ powders,which was introduced into the dye-sensitized solar cell.The photoelectric performances of Sm³⁺ sensitized Eu³⁺ down-conversion photoanode with different amount Sm³⁺ doping were studied.The short circuit current density of the dye-sensitized solar cell with aphotoanode doped with 1 mol% Eu³⁺ and 0.5 mol% Sm³⁺ reaches to 14.08 m A/cm2,which is 32.08% higher than that with Eu³⁺doped TiO₂ photoanode,and the efficiency is also reached to 5.29 %.