Electron affinity of AlxGa1-xN(0001) surfaces

S. P. Grabowski; M. Schneider; H. Nienhaus; W. Mönch; R. Dimitrov; O. Ambacher; M. Stutzmann

doi:10.1063/1.1367275

Electron affinity of Al_xGa_1-xN(0001) surfaces

S. P. Grabowski, M. Schneider, H. Nienhaus, W. Mönch, R. Dimitrov, O. Ambacher, M. Stutzmann

TUM Emeriti of Excellence

Research output: Contribution to journal › Article › peer-review

200 Scopus citations

Abstract

The electronic properties and the electron affinities of Al_xGa_1-xN(0001) surfaces were investigated by ultraviolet photoemission spectroscopy (UPS) over the whole composition range. The samples were prepared by N-ion sputtering and annealing. Surface cleanliness and stoichiometry were monitored with x-ray photoemission spectroscopy. Samples with high aluminum content showed traces of oxygen which could not be removed by further cleaning cycles. However, we have evidence that the oxygen is located in the bulk and not at the surface. From the UP spectra the ionization energies and electron affinities as a function of composition x were determined. A decrease in electron affinity with increasing aluminum content was found, but the electron affinity remains positive for all x. Thus, earlier predictions of negative electron affinity for high aluminum content were not confirmed.

Original language	English
Pages (from-to)	2503-2505
Number of pages	3
Journal	Applied Physics Letters
Volume	78
Issue number	17
DOIs	https://doi.org/10.1063/1.1367275
State	Published - 23 Apr 2001

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title = "Electron affinity of AlxGa1-xN(0001) surfaces",

abstract = "The electronic properties and the electron affinities of AlxGa1-xN(0001) surfaces were investigated by ultraviolet photoemission spectroscopy (UPS) over the whole composition range. The samples were prepared by N-ion sputtering and annealing. Surface cleanliness and stoichiometry were monitored with x-ray photoemission spectroscopy. Samples with high aluminum content showed traces of oxygen which could not be removed by further cleaning cycles. However, we have evidence that the oxygen is located in the bulk and not at the surface. From the UP spectra the ionization energies and electron affinities as a function of composition x were determined. A decrease in electron affinity with increasing aluminum content was found, but the electron affinity remains positive for all x. Thus, earlier predictions of negative electron affinity for high aluminum content were not confirmed.",

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T1 - Electron affinity of AlxGa1-xN(0001) surfaces

AU - Grabowski, S. P.

AU - Schneider, M.

AU - Nienhaus, H.

AU - Mönch, W.

AU - Dimitrov, R.

AU - Ambacher, O.

AU - Stutzmann, M.

PY - 2001/4/23

Y1 - 2001/4/23

N2 - The electronic properties and the electron affinities of AlxGa1-xN(0001) surfaces were investigated by ultraviolet photoemission spectroscopy (UPS) over the whole composition range. The samples were prepared by N-ion sputtering and annealing. Surface cleanliness and stoichiometry were monitored with x-ray photoemission spectroscopy. Samples with high aluminum content showed traces of oxygen which could not be removed by further cleaning cycles. However, we have evidence that the oxygen is located in the bulk and not at the surface. From the UP spectra the ionization energies and electron affinities as a function of composition x were determined. A decrease in electron affinity with increasing aluminum content was found, but the electron affinity remains positive for all x. Thus, earlier predictions of negative electron affinity for high aluminum content were not confirmed.

AB - The electronic properties and the electron affinities of AlxGa1-xN(0001) surfaces were investigated by ultraviolet photoemission spectroscopy (UPS) over the whole composition range. The samples were prepared by N-ion sputtering and annealing. Surface cleanliness and stoichiometry were monitored with x-ray photoemission spectroscopy. Samples with high aluminum content showed traces of oxygen which could not be removed by further cleaning cycles. However, we have evidence that the oxygen is located in the bulk and not at the surface. From the UP spectra the ionization energies and electron affinities as a function of composition x were determined. A decrease in electron affinity with increasing aluminum content was found, but the electron affinity remains positive for all x. Thus, earlier predictions of negative electron affinity for high aluminum content were not confirmed.

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Electron affinity of Al_xGa_1-xN(0001) surfaces

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