A thin film transistor includes a substrate with {HEAD ~ a trench} having first and second sides and {TAIL ~ a bottom}, and a gate electrode at one of the first and second sides of the trench 
having
A thin film transistor includes a substrate with { HEAD ~ a trench } having first and second sides and { TAIL ~ a bottom } , and a gate electrode at one of the first and second sides of the trench
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH