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HEMT performance critically depends on contact resistance, particularly in cryogenic applications, where the semiconductor resistance contributions are reduced, thanks to lower optical phonon scattering rates. The literature offers little about the temperature dependence of contact resistances in HEMTs. We report a temperature-dependent comparison of the annealed and nonannealed ohmic contacts for...
Exfoliated graphene samples have been prepared for use in quantum resistance metrology. Good progress is recently made in achieving contact resistances to graphene of less than 50 Ω. Details are presented on the handling and measurement of graphene samples.
We report on the fabrication of graphene based devices using the micromechanical exfoliation of natural graphite and their electrical characterization including metallic contact resistance measurements, mobility and density charge carriers measurements. The first and major application aimed is the quantrum Hall effect (QHE) metrology. The samples fabricated, from both monolayer and bilayer graphene...
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