Rapid activation of a solution-processed aluminum oxide gate dielectric through intense pulsed light irradiation.

In this study, we report rapid activation of a solution-processed aluminum oxide gate dielectric film to reduce its processing time under ambient atmosphere. Aluminum precursor films were exposed to a high energy light-pulse and completely converted into dielectric films within 30 seconds (450 pulses). The aluminum oxide gate dielectric film irradiated using intense pulsed light with 450 pulses exhibits a smooth surface and a leakage current density of less than 10 ^-8 A cm ^-2 at 2 MV cm ^-1 . Moreover, dielectric constants of the aluminum oxide layer were calculated to be approximately 7. Finally, we fabricated a solution-processed indium gallium zinc oxide thin-film transistor with AlO _x using intense pulsed light irradiation, exhibiting a field-effect mobility of 2.99 cm ² V ^-1 s ^-1 , threshold voltage of 0.73 V, subthreshold swing of 180 mV per decade and I _on / I _off ratio of 3.9 × 10 ⁶ .
Competing Interests: There are no conflicts to declare.
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