Large threshold voltage has been an issue of the amorphous Indium-Gallium-Zinc-Oxide (a-IGZO) based thin film transistors (TFTs), leading to the electrical output characteristic called "Hard saturation". Therefore, a high positive voltage is required to induce the channel layer for achieving the on-state operation of TFT. In this work, the a-IGZO TFTs with dual stacks of gate dielectric layers consisted of SiOx and a buffer layer of Al2O3, HfOx, and HMDS film are developed to improve the interface between a-IGZO layer and gate SiOx insulator layer. The improvement can effectively suppress the hard saturation behaviors. Furthermore, with the buffer layer, the hysteresis effects of the TFTs are reduced obviously, compared to the counterpart of without the buffer layer. The experimental results clearly indicate the proposed stacked a-IGZO TFTs have great potential for the application for the advanced AMLCD technology.
|State||Published - 1 Dec 2009|
|Event||2009 International Display Manufacturing Conference, 3D Systems and Applications, and Asia Display, IDMC/3DSA/Asia Display 2009 - Taipei, Taiwan|
Duration: 27 Apr 2009 → 30 Apr 2009
|Conference||2009 International Display Manufacturing Conference, 3D Systems and Applications, and Asia Display, IDMC/3DSA/Asia Display 2009|
|Period||27/04/09 → 30/04/09|