Photon Energy Upconversion Of Compound TiO₂ Electrode And Its Application In The DSSC

Solar energy,substituting traditional energy,is one of the best ways to resolve these problems.Dye sensitized solar cell?Dye-sensitized solar cell?has become one of the hottest topics in the fields of material science and physics,due to its lower cost,zero environmental pollutions and theoretically high photoelectric conversion efficiency.The photoanode of Titanium dioxide TiO₂ in DSSC can result in better absorption and conversion of sunlight.Therefore,in order to further promote the photoelectric performance of DSSC,the design of photoanode of TiO₂ need to be modified and optimized.Traditional DSSC can absorb visible parts of the sunlight to convert them to electricity,but the absorption of infared parts is very limited.In the present article,we add three different up-conversion rare earth materials into the photoanode of the cell,respectively,with moderate rare earth luminescent materials combining with hollow nano box in graduation.The purpose is to make the photoanode film of DSSC absorb infared light through up-conversion effect,which convert the infared light to visible ones,thus to raise up the concentration of photoelectron and photocurrent,finally to widen the response range of light spectral of the photoelectric cell.What's more,the incident light is scattered mostly by TiO₂hollow box,which can improve the availability of the incident light.Up-conversion rare earth luminescent materials compounding with TiO₂ hollow box can form into heterojunction structure and decrease the composite of photoelectron-hole and emergence of dark current,which contributes to the transimission of electrons in photoanode.The specific research contents and conclusions are as follow:?1?By applying hydrothermal synthesis,up-conversion rare earth luminescent materials,hexagonal NaYF₄:Yb³⁺,Er³⁺and hollow box shape TiO₂ nanoparticle,were prepared,and the composite two materials were added into dye-sensitized solar cells?DSSC?,in order to improve the availability and photoelectric efficiency of the cells to the infrared light.When the mass ratio between NaYF₄:Yb³⁺,Er³⁺in the photoanode of dye-sensitized solar cells and hollow box shape TiO₂ was 5%,the photoelectric conversion efficiency could be up to 7.6%under the irradiation of 100 mW/cm²xenon light,which was raised by 20.7%relative to the condition without luminescent materials.?2?By applying hydrothermal synthesis and roasting method,up-conversion rare earth luminescent materials,Y₂O₃:Er³⁺rare earth materials,were prepared,and the compound of the material and hollow box shape TiO₂ according to specific mass ratio were added into dye-sensitized solar cells.The crystal phase,phase characteristics,microstructure and optical properties of Y₂O₃:Er³⁺were measured through various means of detection.The photoelectric property of dye-sensitized solar cells varying with the change of mass ratio between Y₂O₃:Er³⁺and hollow box shape TiO₂ was investigated through adding different amount of rare earth materials.The research result shows that when the mass ratio between Y₂O₃:Er³⁺and hollow box shape TiO₂ was 4%,the photoelectric efficiency of dye-sensitized solar cells was7.2%,which was raised by 20.7%relative to the condition without luminescent materials.?3?By applying roasting method,rare earth luminescent materials,YF₃:Yb³⁺,Er³⁺were prepared.The compound of the materials and hollow box shape TiO₂nanoparticle were added into the photoanode of dye-sensitized solar cells,in order to improve the availability and photoelectric efficiency of the cells to the infrared light.When the mass ratio between YF₃:Yb³⁺,Er³⁺and hollow box shape TiO₂ was 6%,the photoelectric efficiency was 7.5%,which was raised by 20.5%relative to the condition without luminescent materials.