Novel TIO2 Microstructures for low cost dye sensitized solar cells

Abstract

A critical component of the dye sensitized solar cell (DSSC) is the nano-structured wide bandgap semiconductor (typically TiO 2 ). 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.