Al composition dependence of breakdown voltage in AlxGa1-xN Schottky rectifiers

A. P. Zhang, G. Dang, F. Ren, J. Han, A. Y. Polyakov, N. B. Smirnov, A. V. Govorkov, Joan Marie Redwing, X. A. Cao, S. J. Pearton

Research output: Contribution to journalArticle

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Abstract

Planar geometry, lateral Schottky rectifiers were fabricated on high resistivity AlxGa1-xN (x = 0-0.25) epitaxial layers grown on sapphire substrates. The reverse breakdown voltages of unpassivated devices increased with Al composition, varying from 2.3 kV for GaN to 4.3 kV for Al0.25Ga0.75N. The reverse current-voltage (I-V) characteristics showed classical Shockley-Read-Hall recombination as the dominant mechanism, with I∝ V0.5. The reverse current density in all diodes was in the range 5-10 × 10-6 A cm-2 at 2 kV. The use of p+ guard rings was effective in preventing premature edge breakdown and with optimum ring width increased VB from 2.3 to 3.1 kV in GaN diodes.

Original languageEnglish (US)
Pages (from-to)1767-1769
Number of pages3
JournalApplied Physics Letters
Volume76
Issue number13
DOIs
StatePublished - Mar 27 2000

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rectifiers
electrical faults
diodes
rings
sapphire
breakdown
current density
electrical resistivity
electric potential
geometry

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Zhang, A. P., Dang, G., Ren, F., Han, J., Polyakov, A. Y., Smirnov, N. B., ... Pearton, S. J. (2000). Al composition dependence of breakdown voltage in AlxGa1-xN Schottky rectifiers. Applied Physics Letters, 76(13), 1767-1769. https://doi.org/10.1063/1.126161
Zhang, A. P. ; Dang, G. ; Ren, F. ; Han, J. ; Polyakov, A. Y. ; Smirnov, N. B. ; Govorkov, A. V. ; Redwing, Joan Marie ; Cao, X. A. ; Pearton, S. J. / Al composition dependence of breakdown voltage in AlxGa1-xN Schottky rectifiers. In: Applied Physics Letters. 2000 ; Vol. 76, No. 13. pp. 1767-1769.
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Zhang, AP, Dang, G, Ren, F, Han, J, Polyakov, AY, Smirnov, NB, Govorkov, AV, Redwing, JM, Cao, XA & Pearton, SJ 2000, 'Al composition dependence of breakdown voltage in AlxGa1-xN Schottky rectifiers', Applied Physics Letters, vol. 76, no. 13, pp. 1767-1769. https://doi.org/10.1063/1.126161

Al composition dependence of breakdown voltage in AlxGa1-xN Schottky rectifiers. / Zhang, A. P.; Dang, G.; Ren, F.; Han, J.; Polyakov, A. Y.; Smirnov, N. B.; Govorkov, A. V.; Redwing, Joan Marie; Cao, X. A.; Pearton, S. J.

In: Applied Physics Letters, Vol. 76, No. 13, 27.03.2000, p. 1767-1769.

Research output: Contribution to journalArticle

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T1 - Al composition dependence of breakdown voltage in AlxGa1-xN Schottky rectifiers

AU - Zhang, A. P.

AU - Dang, G.

AU - Ren, F.

AU - Han, J.

AU - Polyakov, A. Y.

AU - Smirnov, N. B.

AU - Govorkov, A. V.

AU - Redwing, Joan Marie

AU - Cao, X. A.

AU - Pearton, S. J.

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AB - Planar geometry, lateral Schottky rectifiers were fabricated on high resistivity AlxGa1-xN (x = 0-0.25) epitaxial layers grown on sapphire substrates. The reverse breakdown voltages of unpassivated devices increased with Al composition, varying from 2.3 kV for GaN to 4.3 kV for Al0.25Ga0.75N. The reverse current-voltage (I-V) characteristics showed classical Shockley-Read-Hall recombination as the dominant mechanism, with I∝ V0.5. The reverse current density in all diodes was in the range 5-10 × 10-6 A cm-2 at 2 kV. The use of p+ guard rings was effective in preventing premature edge breakdown and with optimum ring width increased VB from 2.3 to 3.1 kV in GaN diodes.

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Zhang AP, Dang G, Ren F, Han J, Polyakov AY, Smirnov NB et al. Al composition dependence of breakdown voltage in AlxGa1-xN Schottky rectifiers. Applied Physics Letters. 2000 Mar 27;76(13):1767-1769. https://doi.org/10.1063/1.126161