Dye-sensitized solar cells (DSSC's) have attracted attention in recent years due to the promising energy conversion efficiency using cheap materials, its low production cost and easy preparation. However, many parameters of these devices need to be improved. For example, the electronic transport that occurs by diffusion through the semiconductor oxide film (normally TiO2 nanoparticles). The utilization of carbonaceous materials, such as graphene and carbon nanotubes are then incorporated in the oxide semiconductor, in DSSC's is a potential alternative that can be utilized to improve and enhance the electron transport, since these materials are recognized for their excellent conductive properties. Another problem presented by DSSC's is the use of liquid electrolytes which can cause leaks, solvent evaporation and decrease overall stability. Moreover, replacing the liquid electrolyte by hole conductive materials, polymers or molecules, inorganic or organic, is one of the alternatives that are being investigated and taken as the most promising.In this context, the purpose of this project is to develop DSSC's, where photoelectrodes based on nanocomposites formed by carbonaceous materials (graphene or multi-wall carbon nanotubes (MWCNT)) and semiconducting oxides nanoparticles (TiO2 or ZnO) prepared by different synthesis methods. Additionally, solid-state solar cells (DSSC) prepared using poly(3-hexyltiofeno) (P3HT) as hole conductor and small amounts of lithium ions, will be studied in order to investigate the performance and photoconversion efficiency of these cells.
News published in Agência FAPESP Newsletter about the scholarship: