Resistive InAlN: platform for a new type of high speed electronics
There is a need for novel materials systems that can open a window for sub-THz-frequency electronics. Owing to its record calculated electron velocity, InN is among the hottest candidates.
Recent evaluation of the state-of-the art InN grown by molecular-beam-epitaxy (MBE) indicated the electron velocity of about 1 Í 108 cms-1. However, experimental demonstration of InN-channel transistors is missing to date because of the large lattice misfit between InN and ordinary GaN buffers layers on which InN is normally grown. Elsewhere, it was suggested that InAlN buffer layers with a high In content could resolve this issue by providing better matching.
In our work, we studied magnesium-doping of In-rich InAlN layers by using a metal-organic chemical vapor deposition with varied CP2Mg flow between 0 and 130 nmol/min. We concluded that by magnesium-doping of the In-rich InAlN, mobility of free electrons is the main factor which controls the material resistivity. In future, magnesium-doped InAlN material can be tested for the buffer layer in the design of novel InN/InAlN transistor structures.
Authors: J. Kuzmík, O. Pohorelec, S. Hasenöhrl, M. Blaho, R. Stoklas, E. Dobročka, A. Rosová, Kučera, F. Gucmann, D. Gregušová, M.Precner, A. Vincze, Materials, 16 (2023) 2250
Prepared by Dr. J. Kuzmik