Optimizing Multiwall Carbon Nanotube Weight Ratio for Efficient Charge Transport in Hybrid TiO2 / Polymer Solar Cells

Abstract

This study focuses on enhancing the charge transport in hybrid TiO2/ P3HT solar cells by incorporating Multi Wall Carbon Nanotube (MWCNT) within the nanoporous TiO2 electron transporting layer. We systematically changed the weight ratio of MWCNTs which was blended with TiO2 nanoparticles and studied the effect caused in hole mobility using Time of Flight technique. We found two orders of magnitude increase in hole-mobility while adding 0.02wt % MWCNT into porous TiO2. This is consistent with the corresponding current-voltage characteristics of above solar cells.