The three-terminal n
+-i-δ(p
+)-i-n
+V-groove barrier transistor (VBT) has been successfully fabricated by molecular beam epitaxy (MBE). The base terminal is connected to the δ(p
+), the thin p
+layer, by depositing aluminum on the etched V-groove. The demonstrated device possesses high potential of ultra-high-frequency (

-GHz), high-power, and low-noise capability due to carriers transporting by thermionic emission and being controlled by the base-emitter bias.