Abstract
In this paper, top‐gate self‐aligned a‐IGZO TFTs with copper light shield layer were fabricated. In order to prevent Cu oxidation phenomenon, a SiNx buffer interlayer layer was added. TFT with SiNx buffer interlayer shows excellent VTH uniformity on Gen. 4.5 glass and good PBTS and NBTIS reliability. After these optimization of the thickness of SiNx layer, the Vth shift of PBTS and NBTIS could be improved to 0.5 V and ‐0.8 V.
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