Band profiles of ZnMgO/ZnO heterostructures confirmed by Kelvin probe force microscopy

H. Tampo; H. Shibata; K. Maejima; T. W. Chiu; H. Itoh; A. Yamada; K. Matsubara; P. Fons; Y. Chiba; T. Wakamatsu; Y. Takeshita; H. Kanie; S. Niki

doi:10.1063/1.3157149

Band profiles of ZnMgO/ZnO heterostructures confirmed by Kelvin probe force microscopy

H. Tampo, H. Shibata, K. Maejima, T. W. Chiu, H. Itoh, A. Yamada, K. Matsubara, P. Fons, Y. Chiba, T. Wakamatsu, Y. Takeshita, H. Kanie, S. Niki

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Abstract

The band profiles of ZnMgO/ZnO heterostructures were confirmed through surface potential measurements by Kelvin probe force microscopy. A simple model for the band profile was proposed and the various band parameters were evaluated experimentally and theoretically based on the band model. The band profile was calculated and validated with experimental results using the Schrödinger-Poisson equation. The energy level of the ZnMgO surface donor state, which serves as the source of the two-dimensional electron gas in ZnMgO/ZnO heterostructures, was estimated from the band parameters; nearly identical energy levels around 0.8 eV were obtained for Zn1-x Mgx O layers with Mg compositions x ranging from 0.12 to 0.42 and the corresponding charge densities were estimated to be 8× 1012 cm-2.

Original language	English
Article number	242107
Journal	Applied Physics Letters
Volume	94
Issue number	24
DOIs	https://doi.org/10.1063/1.3157149
Publication status	Published - 2009
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3157149

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title = "Band profiles of ZnMgO/ZnO heterostructures confirmed by Kelvin probe force microscopy",

abstract = "The band profiles of ZnMgO/ZnO heterostructures were confirmed through surface potential measurements by Kelvin probe force microscopy. A simple model for the band profile was proposed and the various band parameters were evaluated experimentally and theoretically based on the band model. The band profile was calculated and validated with experimental results using the Schr{\"o}dinger-Poisson equation. The energy level of the ZnMgO surface donor state, which serves as the source of the two-dimensional electron gas in ZnMgO/ZnO heterostructures, was estimated from the band parameters; nearly identical energy levels around 0.8 eV were obtained for Zn1-x Mgx O layers with Mg compositions x ranging from 0.12 to 0.42 and the corresponding charge densities were estimated to be 8× 1012 cm-2.",

author = "H. Tampo and H. Shibata and K. Maejima and Chiu, {T. W.} and H. Itoh and A. Yamada and K. Matsubara and P. Fons and Y. Chiba and T. Wakamatsu and Y. Takeshita and H. Kanie and S. Niki",

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doi = "10.1063/1.3157149",

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volume = "94",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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T1 - Band profiles of ZnMgO/ZnO heterostructures confirmed by Kelvin probe force microscopy

AU - Tampo, H.

AU - Shibata, H.

AU - Maejima, K.

AU - Chiu, T. W.

AU - Itoh, H.

AU - Yamada, A.

AU - Matsubara, K.

AU - Fons, P.

AU - Chiba, Y.

AU - Wakamatsu, T.

AU - Takeshita, Y.

AU - Kanie, H.

AU - Niki, S.

PY - 2009

Y1 - 2009

N2 - The band profiles of ZnMgO/ZnO heterostructures were confirmed through surface potential measurements by Kelvin probe force microscopy. A simple model for the band profile was proposed and the various band parameters were evaluated experimentally and theoretically based on the band model. The band profile was calculated and validated with experimental results using the Schrödinger-Poisson equation. The energy level of the ZnMgO surface donor state, which serves as the source of the two-dimensional electron gas in ZnMgO/ZnO heterostructures, was estimated from the band parameters; nearly identical energy levels around 0.8 eV were obtained for Zn1-x Mgx O layers with Mg compositions x ranging from 0.12 to 0.42 and the corresponding charge densities were estimated to be 8× 1012 cm-2.

AB - The band profiles of ZnMgO/ZnO heterostructures were confirmed through surface potential measurements by Kelvin probe force microscopy. A simple model for the band profile was proposed and the various band parameters were evaluated experimentally and theoretically based on the band model. The band profile was calculated and validated with experimental results using the Schrödinger-Poisson equation. The energy level of the ZnMgO surface donor state, which serves as the source of the two-dimensional electron gas in ZnMgO/ZnO heterostructures, was estimated from the band parameters; nearly identical energy levels around 0.8 eV were obtained for Zn1-x Mgx O layers with Mg compositions x ranging from 0.12 to 0.42 and the corresponding charge densities were estimated to be 8× 1012 cm-2.

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JO - Applied Physics Letters

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ER -

Band profiles of ZnMgO/ZnO heterostructures confirmed by Kelvin probe force microscopy

Abstract

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