Tunable band offsets in ZnSe/GaAs heterovalent heterostructures grown by metalorganic vapor phase epitaxy
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- Mitsuru Funato
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 606-01, Japan
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- Satoshi Aoki
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 606-01, Japan
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- Shizuo Fujita
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 606-01, Japan
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- Shigeo Fujita
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 606-01, Japan
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抄録
<jats:p>The tunability of band offsets in ZnSe/GaAs(001) heterovalent heterostructures is investigated. The interface composition, Ga/As, is controlled by means of Zn or Se treatment or by thermal etching of the GaAs surfaces before the growth of ZnSe. Consequently, it is revealed by X-ray photoemission spectroscopy that artificial control of Ga/As from 1.0 to 2.8 leads to variation of the valence band offsets from 0.6 to 1.1 eV. Based on the electron counting model and the layer-attenuation model, a structural model which is responsible for the Ga-rich interface and for the increase of valence band offset is proposed, in which the As plane just below the interface consists of As, anti-site Ga and As vacancies. The electronic properties of the n-ZnSe/p+-GaAs heterojunction diodes (HDs) provide further evidence of the tunability of the band offsets at the interface, that is, the diffusion potentials in the HDs are modified according to the interface compositions.</jats:p>
収録刊行物
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- Journal of Applied Physics
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Journal of Applied Physics 82 (6), 2984-2989, 1997-09-15
AIP Publishing
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詳細情報 詳細情報について
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- CRID
- 1362825894911246976
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- NII論文ID
- 30015857710
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- NII書誌ID
- AA00693547
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- DOI
- 10.1063/1.366135
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- ISSN
- 10897550
- 00218979
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