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AlGaN/GaN Heterostructures: Fabrication and Electrical Characterization

  • Couverture cartonnée
  • 156 Nombre de pages
Group III-nitrides, in particular GaN and its heterostructures with AlGaN, have some unique electronic material properties that ma... Lire la suite
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Description

Group III-nitrides, in particular GaN and its heterostructures with AlGaN, have some unique electronic material properties that make these material systems almost ideally suited for the fabrication of a number of high-performance electronic and optoelectronic devices. A study of MBE grown Al0.2Ga0.8N/GaN heterostructures was conducted. Rectifying and ohmic contacts were fabricated for electrical characterization of the heterostructure. These contacts were fabricated by sputter deposition of metal films. A multi-layer Ti/Al/Ni/Au (15/60/35/50nm) metallization and subsequent anneal was employed to form ohmic contacts. A contact resistivity of 2.0 x 10-3 Ohm.cm2 was obtained. Though this value was high but was expected of unintentionally doped n/n Ni Al0.2Ga0.8N/GaN unipolar heterostructure. Rectifying contacts were obtained by depositing Ni on the AlGaN/GaN film, overcoated with Au (Ni/Au, 20/180nm). Fabricated HEMT devices exhibited transistor behavior with transconductance values between of 1.0 and 2.5 mS; however, saturation was not observed. A drift mobility ~130 cm2/V.s was estimated from the calculated transconductance.

Auteur

Michael A. Awaah received his MSc. in Electrical Eng. from Belorussian State Polytechnic Academy in 1993, MS in in Electrical Eng., 2002 and PhD in Material Science and Eng., 2006 from Tuskegee University, AL. He currently service as Assistant Professor of Electrical Eng. at Tuskegee University. He previously worked with Intel Corp.

Détails sur le produit

Titre: AlGaN/GaN Heterostructures: Fabrication and Electrical Characterization
Sous-titre: Fabrication And Electrical Characterization Of AlGaN/GaN HFETs
Auteur:
Code EAN: 9783838371818
ISBN: 978-3-8383-7181-8
Format: Couverture cartonnée
Genre: Généralités et lexiques
nombre de pages: 156
Poids: 224g
Taille: H8mm x B220mm x T150mm
Année: 2010