The effect of hole transport material pore filling on photovoltaic performance in solid-state dye-sensitized solar cells - Burkhard, George F.; Ding, I-Kang.; Gratzel, Michael.; Hardin, Brian E.; Marchioro, Arianna.; McGehee, Michael D.; Melas-Kyriazi, John.; Moser, Jacques-E.; Punzi, Angela.; Tetreault, Nicolas.