Nanocomposite titanium dioxide/polymer photovoltaic cells: effects of TiO2 microstructure, time and illumination power. - Carey, M; Burlakov, V; Henry, B; Kirov, K; Webster, G; Assender, H; Briggs, G; Burn, P; Grovenor, C (ORGANIC PHOTOVOLTAICS IV, 2004)