Abstract
We investigated the influence of organic dielectric surfaces on the electrical characteristics of inorganic amorphous indium-gallium-zinc oxide (a-IGZO)-based thin film transistors (TFTs). To modify the dielectric surface, various self-assembled monolayers and polymer thin films with different functional groups were introduced. Electrical measurements of the a-IGZO TFTs using surface-modified gate dielectrics revealed that the threshold voltages shifted toward positive values as the surface functional groups attract more electrons in the a-IGZO thin films. These results indicate that the channel conductance and carrier density of a-IGZO TFTs could be tuned by simple modification of the dielectric surfaces with organic materials.
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