| 摘要 |
A transistor has a gate electrode, a gate insulation layer structure, a channel layer and source/drain layers. The gate insulation layer structure includes a lower gate insulation layer, a control layer for controlling a threshold voltage of the transistor, and an upper gate insulation layer. The channel layer contacts a surface of the gate insulation layer structure and vertically overlaps the gate electrode. The source/drain layers are adjacent to but not contacting the gate electrode.
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