Research On The Effect Of The Photoelectric Performance Of DSSC With Rare Earth Photoanode

Dye sensitized solar cell is a photovoltaic device that converts solar energy into electrical energy.Under the trend of promoting environment-friendly development,many advantages such as simple preparation process,low cost,wide application scope and relatively high photoelectric conversion efficiency have made good progress.The photoanode is the core component of the dye sensitized solar cell,and the photoelectric properties of the device are closely related to it.By changing the structure and material composition of the photoanode,it is an effective way to improve the power conversion efficiency of the solar cell.The work in this report is the application of rare-earth down conversion and up-conversion luminescent materials to the photoluminescence anode of a cell.Also,two kinds of TiO₂ particles were combined to prepare a composite thin film with strong scattering ability.The rare-earth conversion materials were added to the TiO₂ particles with different morphology according to the mass ratio.The spectral response range of the cell was widened by the effect of optical conversion,and the photoelectric conversion efficiency of the cell was increased.The results and conclusions of the specific research are as follows:（1）Lu₂O₃:Li⁺,Na⁺,Eu³⁺rare-earth converted luminescent materials were prepared by high temperature solid state method.The prepared Lu₂O₃:Li⁺,Na⁺,Eu³⁺are added to the grinded P25-TiO₂ powder by different mass ratio,then a thin film photoanode with down conversion function was prepared.After assembled into a simple battery,it was tested and analyzed by various means.It was found that the efficiency of the cell was the highest when the mass ratio of 3wt.%which was added to 7.47%.（2）Cauliflower TiO₂ nanoparticles were synthesized by hydrothermal reaction,adding a layer of cauliflower TiO₂ nanoparticle films prepared by composite film electrode in pure P25-TiO₂ thin film electrodes.Due to enhanced light scattering ability,the efficiency of the electrode was increased by 6.8%compared with the double-layer pure P25-TiO₂ film electrode.The rare earth conversion material Lu₂O₃:Li⁺,Na⁺,Eu³⁺according to the ratio of added to cauliflower TiO₂ particles of different quality,composite film electrode with the conversion function was made.Testing and analyzing in a variety of ways,it was found that the efficiency of the cell was the highest when the mass ratio of 4wt.%was added to 8.02%.（3）NaYF₄:2%Er³⁺,20%Yb³⁺rare earth upconversion luminescent materials were prepared by hydrothermal method.The NaYF₄:2%Er³⁺,20%Yb³⁺powder was added to the cauliflower like TiO₂ by a certain mass ratio and was assembled into a composite membrane structure with pure P25-TiO₂.Through testing,we found that the synergy between light conversion and light scattering increased the efficiency of the cell.When the mass ratio was 5wt.%,the efficiency of the cell was the highest,reaching 8.18%.NaYF₄:2%Er³⁺,20%Yb³⁺with different particle size and different luminous intensity were prepared by controlling hydrothermal reaction time.The results show that when the hydrothermal reaction is 12h,the photoelectric conversion efficiency of the sample is higher when applied to the photoanode.Meanwhile,it is confirmed that when the rare earth material NaYF₄:2%Er³⁺,20%Yb³⁺are applied to the photoanode,the spectral response range of the battery is indeed widened,and the photoelectric performance of the cell is effectively improved.