Electronic transport characterization of AlGaN/GaN heterostructures using quantitative mobility spectrum analysis

Creative Commons License

LİŞESİVDİN S. B., Yildiz A., ACAR S., Kasap M., Ozcelik S., Ozbay E.

APPLIED PHYSICS LETTERS, vol.91, no.10, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 91 Issue: 10
  • Publication Date: 2007
  • Doi Number: 10.1063/1.2778453
  • Journal Name: APPLIED PHYSICS LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Gazi University Affiliated: Yes

Abstract

Resistivity and Hall effect measurements in nominally undoped Al0.25Ga0.75N/GaN heterostructures grown on sapphire substrate by metal-organic chemical vapor deposition are carried out as a function of temperature (20-350 K) and magnetic field (0-1.5 T). The measurement results are analyzed using the quantitative mobility spectrum analysis techniques. It is found that there is strong two-dimensional electron gas localization below 100 K, while the thermally activated minority carriers with the activation energies of similar to 58 and similar to 218 meV contribute to the electron transport at high temperatures. (C) 2007 American Institute of Physics.