Preparation And Performances Of SDSSCs Devices And Nitrogen-doped Carbon Aerogel Counter Electrode

The basic mechanism, working principle and recent progresses of solid-statedye-sensitized solar cells （SDSSCs） and dye-sensitized solar cells （DSSCs） are brieflyintroduced in the dissertation. The effects of nanocrystalline TiO₂electrode,polymeric hole-transport electrolyte, and counter electrode on the photovoltaicperformance of SDSSCs have been studied. Carbon aerogel is a favorable catalystcandidate for counter electrodes of DSSCs because of the unique features such as lowcost, high electrocatalytic activity and flexible properties. The nitrogen-doped carbonaerogel with different nitrogen contents were prepared, and the effects of the nitrogencontents on the electrocatalytic activity of nitrogen-doped carbon aerogel counterelectrode were discussed. The main study results are as follows：1. The relationship between the photovoltaic performance of the SDSSCs andthe thickness of nanocrystalline TiO₂film was discussed. The results indicate that thehighest efficiency of DSSCs is obtained when the nanocrystalline TiO₂film is treadby TiCl4solution and with a thickness of1.8μm. Synchronously, the effects of thethickness of polymeric hole-transport electrolyte and the annealing temperatures onthe photovoltaic performance of the SDSSCs were studied in detail. The thickness ofpolymeric hole-transport electrolyte plays an important role in improving theopen-circuit voltage （Voc） of the SDSSCs. Usually, the thicker of polymerhole-transport layers, the lower of the Vocs. When the annealing temperature is about65℃, The SDSSCs with the triphenylamine derivative （H1） as sensitizer and P3HT aspolymer hole-transport materials show the highest PCE values and fill factors.2. Several kinds of nitrogen-doped carbon aerogels with different nitrogencontents were prepared. After doped by nitrogen, the mesopore volume of the carbonaerogel increase, and the pore size concentratively distributes between10and30nm。However, the photovoltaic performance of the DSSCs based on nitrogen-dopedcarbon aerogels CEs would reduce with the increase of the nitrogen contents ofnitrogen-doped carbon aerogels. It is found that the adhesive performance of nonpolarPTFE falls with the increase of nitrogen content because the polarity of nitrogen ishigher than carbon. It leads to the increase of the internal series resistance of thenitrogen-doped carbon aerogel counter electrodes. Therefore, the short-circuitcurrents and the photovoltaic performances of the DSSCs reduce with the increase of nitrogen contents.