The photoconduction (PC) properties of single-crystalline titanium dioxide (TiO2) nanorods (NRs) with anatase phase were investigated and compared. By examining the material's inherent properties, the anatase TiO2 NRs exhibit superior PC efficiency (quantitatively defined by normalized gain) which is near one order of magnitude higher than that of the rutile ones. The optimal photoconductive gain of the anatase NR device can also reach 1.6 × 107 at the light intensity of 0.02 Wm−2 and a low bias of 0.1 V. The power-dependent and time-resolved PC measurements were performed to investigate the physical mechanisms. The higher quantum efficiency and mobility product was confirmed to be responsible for the higher PC efficiency in the anatase TiO2 NRs in comparison to the rutile ones.
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Chen et al. (2014) studied this question.
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