Replacement of In2O3:Sn (ITO) as the industry standard n-type transparent conducting oxide (TCO) is a global research goal for materials scientists. Alternative n-type TCOs include ZnO:Al and SnO2:Sb/F, however these materials have not yet yielded conductivities consistent with ITO. In this study we use first principles methods to understand the reasons for the under performances of these alternative TCOs, and attempt to predict alternative pathways to higher performance.