The demonstration of a salicidelike self-aligned contact technology for III-V metal-oxide-semiconductor field-effect transistors (MOSFETs) is reported. A thin and continuous crystalline germanium-silicon (GeSi) layer was selectively formed on n+ doped gallium arsenide (GaAs) regions by epitaxy. A new self-aligned nickel germanosilicide (NiGeSi) Ohmic contact with good morphology was achieved using a two-step annealing process with precise conversion of the GeSi layer into NiGeSi. NiGeSi contact with the contact resistivity (ρ e) of 1.57 mm and sheet resistance (Rsh) of 2.8/ was achieved. The NiGeSi-based self-aligned contact technology is promising for future integration in high performance III-V MOSFETs.
|Journal||Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics|
|State||Published - 1 Jan 2011|