Al composition dependent properties of quaternary AlInGaN Schottky diodes

Y. Liu, H. Jiang, T. Egawa, B. Zhang, Hiroyasu Ishikawa

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Pd Schottky barrier diodes were fabricated on undoped AlxIn 0.02Ga0.98-xN/GaN with x less than 20%. The material properties, which were characterized by photoluminescence, x-ray diffraction, and atomic force microscopy, indicated that the quaternary samples were coherently grown on GaN template with high crystalline quality. The flatband barrier height obtained by capacitance-voltage (C-V) measurement increased with increasing Al mole fraction (increasing the band gap of the quaternary) up to 2.06 eV, in agreement with the predictions of the Schottky-Mott theory. However, current-voltage (I-V) measurements revealed that the barrier height decreased from 1.32 to 1.12 eV, which was accompanied by an increase in ideality factor from 1.04 to 1.73. The large difference of barrier height between I-V and C-V measurements could not be quantitatively explained by the traditional electron transport mechanisms of Schottky diode, such as tunneling effect, image force effect, and barrier inhomogeneity theory. Strong polarization effect in strained AlxIn0.02Ga0.98-xN/GaN heterostructure was proposed to account for the experimental results, since similar phenomena had been observed extensively in strained AlyGa1-yN/GaN heterojunction structures.

Original languageEnglish
Article number123702
JournalJournal of Applied Physics
Volume99
Issue number12
DOIs
Publication statusPublished - 2006
Externally publishedYes

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Schottky diodes
electrical measurement
capacitance
heterojunctions
inhomogeneity
x ray diffraction
templates
atomic force microscopy
photoluminescence
electric potential
polarization
predictions
electrons

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this

Al composition dependent properties of quaternary AlInGaN Schottky diodes. / Liu, Y.; Jiang, H.; Egawa, T.; Zhang, B.; Ishikawa, Hiroyasu.

In: Journal of Applied Physics, Vol. 99, No. 12, 123702, 2006.

Research output: Contribution to journalArticle

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