Application Of Doped FTO In Quantum Dot Sensitive Solar Cell Electrode

Developing clean and renewable energy has become the focus of current research owing to the depletion of fossil energy and environmental pollution. Recently, Quantum Dot Sensitized (QDS) solar cells have attracted scientists’ attention because of the Multiple Exciton Generation (MEG) effect. However, the photoelectric conversion efficiency is still low. In this thesis, novel counter electrodes of FTO doped transition metals (Cu, Co, Ni, Fe, Zn) is designed and fabricated to improve the stability of QDS solar cells and the conductivity and catalytic activity are also studied in details.In the introduction, we addressed the current issues of energy and environmental pollution, as well as the work principle and the current progress of QDS solar cells. The experiment materials, characterization and analysis methods are presented in the second chapter, the preparation of FTO doped transition metal (Cu, Co, Ni, Fe, Zn) nanoparticles and the application in QDS solar cells are stated in the third chapter, the preparation of photoanode in Dye Sensitized Solar Cells by screen printing, and the effect of film thickness on the cell performance is discussed in the fourth chapter, and the main achievements as are summarized in the fifth chapter.FTO doped transition metal (FTO-Cu, FTO-Co, FTO-Ni, FTO-Fe, FTO-Zn) are adopted as the counter electrodes in CdS/CdSe QDS solar cells, an illumination under AM 1.5 100 mW/cm2 is carried out. It is found that the solar cells with FTO-Co electrode exhibit the highest photoelectric conversion efficiency of 3.18%, and the best long-term stability. But the solar cells with FTO-Cu, FTO-Ni, FTO-Fe and FTO-Zn electrodes display the photoelectric conversion efficiency of 2.59%, 1.44%,2.58% and 1.17%, respectively. The solar cells with Pt and FTO electrode as reference have the photoelectric conversion efficiency of 2.15% and 2.63%, respectively.By screen printing method, the DSSCs’ photo-anode with the film thickness of 9 μm is fabricated, and the highest photoelectric conversion efficiency of 7.49% is achieved in the QDS solar cells.