Abstract
Effects of Ti(iso-C 3H 7O) 4 and TiCl 4 treatments on the photoinduced charge carrier kinetics of nanocrystalline porous TiO 2 films were studied by time-resolved microwave conductivity measurements. Both treatments greatly influence the transient microwave photoconductivity decay behaviors by increasing the photogenerated charge carrier concentration and diminishing the charge carrier recombination via suppressing the hole-trapping defects. This leads to improve the I– V behaviors of nanocrystalline porous TiO 2 films effectively. The results are discussed in terms of surface modification of anatase nanocrystallites which grow on the film surface by hydrolysis of Ti(iso-C 3H 7O) 4 and TiCl 4 during the treatments.
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