Schottky barrier height and electron affinity of titanium on AIN

B. L. Ward, J. D. Hartman, E. H. Hurt, K. M. Tracy, R. F. Davis, Robert Nemanich

Research output: Contribution to journalArticle

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Abstract

Approximately 100 or 1000 Å of AlN was deposited on the (0001)Si-face of on-axis n-type 6H-SiC. The surfaces were examined by ultraviolet photoemission spectroscopy (UPS) utilizing the He I α (21.2 eV) and the He II α (40.8 eV) excitation. Experimental difficulties are discussed. Titanium was deposited on the clean surface of in situ grown AlN. The titanium-AlN interface was also characterized with UPS. Two approaches are presented to identify the valence band maximum (VBM) and the electron affinity χ of the clean surface of AlN was found to be either 0 to 1 eV depending upon the position of the valence band edge. The same assumptions were applied to the analysis of the Ti/AlN interface and, for the case of χ=0 eV, the position of the valence band maximum is 3.4 eV below the position of the Fermi level. For the case of χ=1 eV, the position of the valence band maximum is 4.4 eV below the position of the Fermi level. Therefore, the p-type Schottky barrier height of titanium on AlN is measured to be 3.4±0.2 or 4.4±0.2 eV for χ=0 eV and χ=1 eV, respectively. Independent of the selection of the valence band maximum, the observed Schottky barrier differed from that predicted by the Schottky-Mott model by 1.5±0.2 eV.

Original languageEnglish (US)
Pages (from-to)2082-2087
Number of pages6
JournalJournal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Volume18
Issue number4
StatePublished - 2000
Externally publishedYes

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Electron affinity
Valence bands
electron affinity
affinity
titanium
Titanium
valence
Photoelectron spectroscopy
Fermi level
Ultraviolet spectroscopy
photoelectric emission
spectroscopy
excitation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)
  • Surfaces and Interfaces
  • Condensed Matter Physics

Cite this

Schottky barrier height and electron affinity of titanium on AIN. / Ward, B. L.; Hartman, J. D.; Hurt, E. H.; Tracy, K. M.; Davis, R. F.; Nemanich, Robert.

In: Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures, Vol. 18, No. 4, 2000, p. 2082-2087.

Research output: Contribution to journalArticle

Ward, B. L. ; Hartman, J. D. ; Hurt, E. H. ; Tracy, K. M. ; Davis, R. F. ; Nemanich, Robert. / Schottky barrier height and electron affinity of titanium on AIN. In: Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures. 2000 ; Vol. 18, No. 4. pp. 2082-2087.
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AU - Ward, B. L.

AU - Hartman, J. D.

AU - Hurt, E. H.

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AU - Davis, R. F.

AU - Nemanich, Robert

PY - 2000

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N2 - Approximately 100 or 1000 Å of AlN was deposited on the (0001)Si-face of on-axis n-type 6H-SiC. The surfaces were examined by ultraviolet photoemission spectroscopy (UPS) utilizing the He I α (21.2 eV) and the He II α (40.8 eV) excitation. Experimental difficulties are discussed. Titanium was deposited on the clean surface of in situ grown AlN. The titanium-AlN interface was also characterized with UPS. Two approaches are presented to identify the valence band maximum (VBM) and the electron affinity χ of the clean surface of AlN was found to be either 0 to 1 eV depending upon the position of the valence band edge. The same assumptions were applied to the analysis of the Ti/AlN interface and, for the case of χ=0 eV, the position of the valence band maximum is 3.4 eV below the position of the Fermi level. For the case of χ=1 eV, the position of the valence band maximum is 4.4 eV below the position of the Fermi level. Therefore, the p-type Schottky barrier height of titanium on AlN is measured to be 3.4±0.2 or 4.4±0.2 eV for χ=0 eV and χ=1 eV, respectively. Independent of the selection of the valence band maximum, the observed Schottky barrier differed from that predicted by the Schottky-Mott model by 1.5±0.2 eV.

AB - Approximately 100 or 1000 Å of AlN was deposited on the (0001)Si-face of on-axis n-type 6H-SiC. The surfaces were examined by ultraviolet photoemission spectroscopy (UPS) utilizing the He I α (21.2 eV) and the He II α (40.8 eV) excitation. Experimental difficulties are discussed. Titanium was deposited on the clean surface of in situ grown AlN. The titanium-AlN interface was also characterized with UPS. Two approaches are presented to identify the valence band maximum (VBM) and the electron affinity χ of the clean surface of AlN was found to be either 0 to 1 eV depending upon the position of the valence band edge. The same assumptions were applied to the analysis of the Ti/AlN interface and, for the case of χ=0 eV, the position of the valence band maximum is 3.4 eV below the position of the Fermi level. For the case of χ=1 eV, the position of the valence band maximum is 4.4 eV below the position of the Fermi level. Therefore, the p-type Schottky barrier height of titanium on AlN is measured to be 3.4±0.2 or 4.4±0.2 eV for χ=0 eV and χ=1 eV, respectively. Independent of the selection of the valence band maximum, the observed Schottky barrier differed from that predicted by the Schottky-Mott model by 1.5±0.2 eV.

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