| Based on the energy sources crisis and the high cost of silicon cells,developing a new-style solar cell is becoming a must. Because of its lowcost and technology requirement, Dye-sensitized Solar Cells (DSC) is ahighlight of this research area.Researchers obtain the highest efficiency11.5%) by far. Though it is put into production in miniature,there is nomodel can explain the electron transport mechanism thoroughly.In orderto enhance the cell efficiency,we have to investigate its electron transportand back reaction mechanism more farther.In this thesis,we give a short introduction of DSC theory researchbackground, cell structure, working mechanism, photovoltaic parameterand the common photo-electrochemical measurement in chapter one. Westate the character of several interface and review the basic theory modelbased on electrolyte or semiconductor or equivalent circuit in the secondchapter. The electron transport and back reaction in DSC are investigatedby the electrochemistry impedance spectrum (EIS) and the Intensity-Modulated Photocurrent Spectroscopy (IMPS) and the Intensity-Modulated Photovoltage Spectroscopy (IMVS). Theoretically, weintroduced two corresponding models in detail. In chapter four, differentinterface-modifying methods were investigated. Meanwhile, we utilizedEIS/IMPS/IMVS to analysis the electron transport and back reaction inthe cell through blocking layer and films-optimizing byelectrodeposition.We also argued the character of the TiO2/TCO interfacethrough PPO experiment.The value of electron lifetime, diffusioncoefficient, electron transit time, diffusion length and IPCE can beobtained respectively. Finally, a summary of this dissertation and anoutlook of DSC research are presented in the last chapter.This thesis not only summarized the DSC working mechanism modle, but also investigated the electron transport and back reaction dynamicsthrough experiments and EIS/IMPS/IMVS to analysis the cellperformance. These work will be valuable to DSC research andapplication.
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