Novel TiO2 Microstructures for Low Cost Dye Sensitized Solar Cells
DOI:
https://doi.org/10.24084/repqj09.541Abstract
A critical component of the dye sensitized solar cell (DSSC) is the nano-structured wide bandgap semiconductor (typically TiO2 ). The particle size, crystal structure, orientation, and scale of interconnected porosity are all critical to cell performance. In our lab, we have engineered and produced ceramic pastes including a hierarchy of nano- to micron-sized particles of varying morphologies and texture which yield novel, hybrid microstructures. We assert that while the nano-material provides the surface area, the micro particles provide conduits for easier diffusion of photo-generated electrons through the titania and also a pore structure for percolation of dye and electrolyte, giving enhanced photo-current and power output. The pastes also are of practical benefit, as they avoid shrinkage cracks during drying, and result in high quality thick films.