Publication

Regrowth-free Gan Rf Hemts Achieving <i>f</i><sub>max</sub> of 403 Ghz Via Periodic Contact Structures

2026

Abstract

A regrowth-free sub-THz HEMT is demonstrated using a periodic contact scheme that transforms conventional linear contacts into a configuration with far better contact resistance ( R-C ). This method yielded consistently low R-C down to 0.15 Omega mm . Furthermore, this technique is based on a Au-free low-temperature annealing metalization (Ti/Al), which results in extremely smooth edges, allowing for sub-500 nm channel scaling. These features enabled - for the first time - the demonstration of regrowth-free GaN RF HEMT with f(t)/f(max) of 176/403 GHz. These results are comparable to the best GaN HEMTs with similar geometry, highlighting the enormous potential of periodic contact structures for high performance RF and sub-THz devices.

Official source

https://infoscience.epfl.ch/entities/publication/c75cffe7-295b-4885-848e-e990a68c15a3

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c75cffe7-295b-4885-848e-e990a68c15a3

About this result

Related concepts (29)

Geometry

Geometry (; ) is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. Geometry is, along with arithmetic, one of the oldest branches of mathematics. A mathematician who works in the field of geometry is called a geometer. Until the 19th century, geometry was almost exclusively devoted to Euclidean geometry, which includes the notions of point, line, plane, distance, angle, surface, and curve, as fundamental concepts.

Elliptic geometry

Elliptic geometry is an example of a geometry in which Euclid's parallel postulate does not hold. Instead, as in spherical geometry, there are no parallel lines since any two lines must intersect. However, unlike in spherical geometry, two lines are usually assumed to intersect at a single point (rather than two). Because of this, the elliptic geometry described in this article is sometimes referred to as single elliptic geometry whereas spherical geometry is sometimes referred to as double elliptic geometry.

Non-Euclidean geometry

In mathematics, non-Euclidean geometry consists of two geometries based on axioms closely related to those that specify Euclidean geometry. As Euclidean geometry lies at the intersection of metric geometry and affine geometry, non-Euclidean geometry arises by either replacing the parallel postulate with an alternative, or relaxing the metric requirement. In the former case, one obtains hyperbolic geometry and elliptic geometry, the traditional non-Euclidean geometries.

Related publications (1)

Regrowth-free Gan Rf Hemts Achieving <i>f</i><sub>max</sub> of 403 Ghz Via Periodic Contact Structures

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