探討結構與製程對於染料敏化太陽能電池之研究

Abstract

The objects of the work are to study the effects of the preparation conditions of the electrodes and the carbon nanotubes on the performance of the dye-sensitized titanium dioxide solar cells. By the analysis of the titanium dioxide and carbon nanotube thin film electrodes, the effects of the electrodes on the interfacial redox reaction were examined. By testing the processing and compositions of the dye-sensitized solar cells, the most efficiency processes were found in this study. Apply the titanium dioxide photo electrodes on the dye-sensitized solar cells, it need to adsorb a layer of dyes to increase the conductivity of electrons. This research dips the TiO2 electrodes in TCPP solution with 0.2mM DCA in a long time. We are coating ITO counter electrodes with platinum about 50 nm and with silver about 100 nm, respectively. The open circuit voltage increase because of isolation the titanium dioxide with iodide ions after addition of the ions liquids. Besides, added DCA into the TCPP solution let electrons easily excited to the LUMO level of the titanium dioxide therefore increase both of photo circuits and photo voltages. The counter electrodes with carbon nanotubes are more stable than metal counter electrodes due to the carbon nanotubes had an excellent chemical resistance although the efficiency did not higher than the cell with metal counter electrodes. About the composition of the solar cell, the best performance solar cell was dips in TCPP solution with 0.2mM DCA, the electrolyte injected with 0.5M TBP . On an incident light intensity of 1.5 mW/cm2, it corresponds to an overall power efficiency of 2.15%.Finally we get a best efficiency about 7.63% with the best processing in silver counter electrode, and 2.34% in CNT counter electrode respectively.