Preparation And Properties Of Quantum Dots Sensitized Solar Cell Photoanode

With the rapid development of science and technology,the consumption of fossil fuels is very large which leads to the increasingly serious energy crisis,and its use in the process of environmental pollution will cause a series of problems,in order to solve this problem,people have been committed to the development of new clean and renewable energy and photovoltaic power generation equipment.Solar energy is the ideal new energy for solving the environmental problems and energy problems facing mankind.Quantum dot sensitized solar cells?QDs?are the third generation of solar cells,which have attracted wide attention because of their high photoelectric conversion efficiency and low cost.However,due to the limitations of material and interface structure and other factors,the efficiency of quantum dot sensitized solar cells is unstable and still far below its theoretical conversion efficiency.Therefore,how to improve the battery structure and enhance the photoelectric conversion ability is the focus of current research.In this paper,photoanode of quantum dot sensitized solar cell as the main object of study,through the introduction of Mn²⁺,Yb³⁺,Er³⁺to NaYF₄ to get the up-conversion luminescence materials,and doped into the TiO₂ photoanodes,through the performance change conversion luminescent materials doped nano mass ratio of solar cell regulation,in order to optimize the TiO₂ photoanode structure,improving the efficiency of the solar cells to improve the performance of solar cells,the performance changes by changing the light anode preparation parameters to study the solar cell,Meanwhile,g-C₃N₄ is also introduced to prepare g-C₃N₄/TiO₂ composite photoanodeand the performance of the solar cell is studied by adjusting the content,provides the reference for the further research of quantum dot sensitized solar cell.The innovation of this paper and the main results are as follows:1.By the spin coating preparation of mesoporous TiO₂ thin films and in doped Mn²⁺-NaYF₄:Yb³⁺,Er³⁺upconversion luminescence nano materials,using CdS/CdSe quantum dots as co-sensitizer,CuS as the electrode structure of the assembled quantum dot sensitized solar cell device,explore the influence of different mass ratio on the conversion of materials doped TiO₂ films on the performance of the solar cell.The results show that the performance of the solar cell is best when 8wt%Mn²⁺-NaYF₄:Yb³⁺Er³⁺?UCNPs?/TiO₂ and the film thickness is about 8?m.2.The use of g-C₃N₄/TiO₂ nanometer thin films prepared by spin coating to the substrate,using CdS/CdSe quantum dots as co-sensitizer,ZnS as passivation layer,and and CuS as the counter electrode structure,by adjusting the doping ratio of g-C₃N₄,to obtain the experimental data of the change of properties of solar cells.The data indicate that doping 10g-C₃N₄ is beneficial to the separation and transportation of electron hole pairs,which significantly improves the open circuit voltage and short-circuit current of solar cells,and makes the efficiency of g-C₃N₄ doped 3.24%increase to 4.14%.The efficiency was increased by 27.8%.