Supplementary Information Where Do Photogenerated Holes Go in Anatase:Rutile TiO 2 ? A Transient Absorption Spectroscopy Study of Charge Transfer and Lifetime Andreas Kafizas, †a * Xiuli Wang, †ab Stephanie R. Pendlebury, a Piers Barnes, a Min Ling, c Carlos Sotelo-Vazquez, c Raul Quesada-Cabrera, c Can Li, b Ivan P. Parkin c and James R. Durrant a * a Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK b State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian,116023, China c Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK *corresponding authors, † both authors contributed equally Synthesis of nanocrystalline anatase thin-films Dense nanocrystalline thin-films of anatase were grown by atmospheric pressure chemical vapour deposition (APCVD). This involved the reaction of TiCl 4 [Ti source] with ethyl acetate [O source] at 500 °C in a cold-walled reactor. The precursors were stored in steel bubblers and heated to increase their vapour pressures. The vapours of each precursor were carried to the reactor using N 2 carrier gas (inert under the conditions imposed). Films were grown on quartz substrates heated on a graphite block. A schematic of the APCVD apparatus is provided in Figure S1, with the synthetic conditions listed in Table S1.