Ertl, F. and Asperger, T. and Deutschmann, R. A. and Wegscheider, Werner and Bichler, Max and Böhm, G. and Abstreiter, Gerhard
Vertical field effect transistors realized by cleaved-edge overgrowth.
Physica E Low-dimensional Systems and Nanostructures 13 (2-4), pp. 920-924.
We present a brief survey of vertical transistor devices fabricated by the cleaved-edge overgrowth technique. Different device types are realized using different transistor substrates grown by molecular beam epitaxy. These substrates mainly vary in the layer sequence and thickness between the source/drain contacts. Common to all designs is the vertical gate structure overgrown on a cleavage plane of the substrates. By biasing the gate a two-dimensional electron system of tunable density is induced between source/drain. We study the DC transport properties of long channel (source–drain distance not, vert, similar1 μm) as well as short-channel (source–drain distance not, vert, similar50 nm) devices. Also the choice of the source/drain isolation (a superlattice or a p+-δ-doping or a heterobarrier) affects the characteristic device behavior.