Study Of Indolo[3,2,1-jk] Carbazole Derivatives-sensitized And Carbon Quantum Dots-sensitized Solar Cells

Solar cell is the hot spot of new energy research in the worldwide. Up to now, solar cells have been developed to the third generation. The new-generation solar cell is considered to be the most promising photovoltaic devices because of its simple process and low cost. The dye sensitized and the quantum dot sensitized solar cells are particularly noteworthy. This dissertation studies the indole [3,2,1-jk] carbazole derivatives and the carbon quantum dots used as dyes to sensitize solar cells. The main research work is as follows:(1) The solar cell employing indole [3,2,1-jk] carbazole derivatives containing different π-bridges (thiophene ring and benzene ring) of organic dyes were studied. First, the highest occupied molecular orbital (HOMO) levels, the lowest unoccupied molecular orbital (LUMO) levels and the spectral performance were calculated theoretically. The nano-particle TiO2porous film anode was fabricated and the organic dye sensitized solar cell was assembled. The photovoltaic performances of fabricated cells were investigated. The results showed that indole [3,2,1-jk] carbazole derivative containing thiophene rings π-bridge showed the better photovoltaic properties and the power conversion efficiency of the cell reached3.68%;(2) The carbon quantum dots solar cell was fabricated. First, three kinds of carbon quantum dots were synthesized based on one-step synthesis process by using different carbon source (citric acid or glucose). The photoelectric properties of the cells based on these carbon quantum dots-sensitized solar cells were investigated. The experimental results indicated that the water-soluble carbon quantum dots, which was prepared by using glucose as carbon source and dopamine as capping ligand show the best photoelectric conversion properties. The photoelectric conversion reached0.52%, higher than the previously reported result of0.11%;(3) The quantum dot sensitized solar cells based on the polysulfide electrolyte was studied in order to solve the unstability of the electrolyte. First, the polysulfide electrolyte has prepared. The Cu2S cathode based on bulk copper corrosion method and the metal sulfide compounds had been employed to replace the traditional platinum film cathode. The photoelectric properties of the solar cells were analyzed. The results indicated that the developed polysulfide electrolyte had better stability than the traditional iodide-based electrolyte for quantum dot sensitized solar cells. The higher short circuit current had been obtained for the former electrolyte.At last, the results about the indole [3,2,1-jk] carbazole derivatives dye and carbon quantum dots sensitized solar cells were summarized. The study work of this dissertation has a certain guiding significance for the new-generation solar cell.