Publications de Marcus Gonschorek

Physical Properties of Al1-xInxN/(AIN)/GaN (0.07

AlInN is a material which is known to be difficult to be grown among the III-nitride ternary compounds. It attracted much attention only recently and starts to be studied intensively mainly for electronic applications. The aim of this work is manifold. Var ...

EPFL2011

Self heating in AlInN/AlN/GaN high power devices: Origin and impact on contact breakdown and IV characteristics

Nicolas Grandjean, Jean-François Carlin, Eric Feltin, Marcel Py, Marcus Gonschorek

It is observed experimentally that high electron mobility transistor devices with short channel length processed from nitride AlInN/AlN/GaN heterostructures containing 2D electron gases (2DEGs) with densities beyond 2 x 10(13) cm(-2) exhibit temperatures u ...

American Institute of Physics2011

High-speed and low-noise AlInN/GaN HEMTs on SiC

Nicolas Grandjean, Jean-François Carlin, Eric Feltin, Marcus Gonschorek

A comparison of devices with different source-drain gaps has been performed on AlInN/GaN high electron mobility transistors (HEMTs) grown on SiC. The cut-off frequency is effectively improved through shrinking source drain space and reducing gate parasitic ...

Wiley2011

Low-Noise Microwave Performance of 0.1 mu m Gate AlInN/GaN HEMTs on SiC

Nicolas Grandjean, Jean-François Carlin, Eric Feltin, Marcus Gonschorek

We report the first microwave noise characterization of AlInN/GaN HEMTs. Transistors with a 0.1 mu m gate implemented on a semi-insulating SiC substrate achieve a maximum current density of 1.92 A/mm at V-GS = 0 V, a measured transconductance g(M) = 480 mS ...

2010

Ultrahigh-Speed AlInN/GaN High Electron Mobility Transistors Grown on (111) High-Resistivity Silicon with F-T=143 GHz

Nicolas Grandjean, Jean-François Carlin, Eric Feltin, Marcus Gonschorek

We report on ultrahigh-speed 80 nm AlInN/GaN high-electron-mobility transistors (HEMTs) grown on (111) high-resistivity silicon substrates. The devices feature a peak measured transconductance g(M) = 415 mS/mm, a maximum current of 1.43 A/mm with a ratio I ...

2010

High-Mobility AlGaN/GaN Two-Dimensional Electron Gas Heterostructure Grown on (111) Single Crystal Diamond Substrate

Nicolas Grandjean, Marco Malinverni, Pierre Stadelmann, Denis Martin, Anas Mouti, Marcel Py, Marcus Gonschorek

High mobility Al0.28Ga0.72N/GaN two-dimensional electron gas (2DEG) is achieved on ( 111) oriented single crystal diamond substrate. The surface morphology of the epilayer is free of cracks thanks to the use of an AlN interlayer for strain relaxation. The ...

2010

Metal-related gate sinking due to interfacial oxygen layer in Ir/InAlN high electron mobility transistors

Nicolas Grandjean, Jean-François Carlin, Marcus Gonschorek

We report on an annealing-induced "gate sinking" effect in a 2-nm-thin In0.17Al0.83N/AlN barrier high electron mobility transistor with Ir gate. Investigations by transmission electron microscopy linked the effect to an oxygen containing interlayer between ...

2010

Characterization of Plasma-Induced Damage of Selectively Recessed GaN/InAlN/AlN/GaN Heterostructures Using SiCl4 and SF6

Nicolas Grandjean, Jean-François Carlin, Marcus Gonschorek

We have investigated an inductively coupled plasma etching recipe using SiCl4 and SF6 with a resulting selectivity >10 for GaN in respect to InAlN. The formation of an etch-resistant layer of AlF3 on InAlN required about 1 min and was noticed by a 4-times- ...

2010

Proposal and Performance Analysis of Normally Off n(++) GaN/InAlN/AlN/GaN HEMTs With 1-nm-Thick InAlN Barrier

Nicolas Grandjean, Jean-François Carlin, Eric Feltin, Marcus Gonschorek

Design considerations and performance of n(++) GaN/InAlN/AlN/GaN normally off high-electron mobility transistors (HEMTs) are analyzed. Selective and damage-free dry etching of the gate recess through the GaN cap down to a 1-nm-thick InAlN barrier secures p ...

2010

100-nm-Gate (Al,In)N/GaN HEMTs Grown on SiC With F-T=144 GHz

Nicolas Grandjean, Jean-François Carlin, Eric Feltin, Marcus Gonschorek

One-hundred-nanometer-gate (Al, In) N/GaN highelectron- mobility transistors (HEMTs) grown on semi-insulating SiC achieve a maximum current density of 1.84 A/mm at V-GS = 0 V, an extrinsic transconductance of 480 mS/mm, and a peak current gain cutoff frequ ...

Institute of Electrical and Electronics Engineers2010