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First, we report unique performance transistors based on a sol-gel processed indium zinc oxide/ single-walled carbon nanotubes (SWNTs) composite thin films.In the composite, SWNTs provide fast tracks for carrier transport to significantly improve the apparent field effect mobility.Specifically, the composite thin film transistors (TFTs) with SWNTs weight concentration in the range of 0 to 1% have been investigated with the field effect mobility reaching as high as 140 cm2/V·s at 1 wt% SWNTs while maintaining a high on/off ratio ~107.