Resonant Tunneling Permeable Base Transistor for RF applications

A technique is developed to embed tungsten inside semiconductors, with the possibility to combine the metallic elements and semiconductor heterostructure with nm-precision. This technique enables to fabricate a very high quality permeable base type of transistor. A resonant tunneling permeable base transistor, RT-PBT is fabricated by directly integrating a tungsten grating 30 nm above a pseudomorphic RTD. Double barrier heterostructure (AlGaAs/InGaAs) is grown by molecular beam epitaxy and the wafer is patterned by e-beam lithography to form the grating. Common collector current-voltage characteristics were measured at room temperature.