Effects of UV light and carbon nanotube dopant on solution-based indium gallium zinc oxide thin-film transistors

We studied the effects of ultraviolet (UV) light and the electrical properties of solution-based indium gallium zinc oxide single-walled carbon nanotube thin-film transistors (SB-IGZO/SWNT TFT), compared with those of solution-based IGZO TFT. Of these devices, the SB-IGZO/SWNT TFT had excellent photo-induced current-sensitivity under illumination and significantly slower recovery of the transfer characteristics after switching off the UV light. To explain these unique photo-response behaviors, we believe that SWNTs play an important role as carrier transport rods during device operation and as electron traps in the device off-state, along with electron–hole pairs due to the UV light illumination.