The thin film transistor further includes a gate insulating layer on {TAIL ~ the entire surface} of the substrate including the gate electrode, and an active layer on the gate insulating layer along the trench, the active layer having source and drain regions substantially outside {HEAD ~ the trench} 
The thin film transistor further includes a gate insulating layer on { TAIL ~ the entire surface } of the substrate including the gate electrode , and an active layer on the gate insulating layer along the trench , the active layer having source and drain regions substantially outside { HEAD ~ the trench }
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