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Energy band alignment of MgO (111)/ZnO (0002) heterojunction determined by X-ray photoelectron spectroscopy |
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| Authors: | K. Shi P.F. Zhang H.Y. Wei C.M. Jiao C.M. Li X.L. Liu S.Y. Yang Q.S. Zhu Z.G. Wang |
| Affiliation: | 1. Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Republic of Korea;2. Department of Physics, Yonsei University, 1 Yonseidae-gil, Wonju-si, Gangwon-do 220-710, Republic of Korea |
| Abstract: | X-ray photoelectron spectroscopy (XPS) was used to measure the energy discontinuity in the MgO (111)/ZnO (0002) heterostructure. The valence band offset (VBO) was determined to be 1.22±0.23 eV and a type-I heterojunction with a conduction band offset (CBO) of 3.24±0.23 eV was obtained. The discrepancy of VBO values between MgO/ZnO and ZnO/MgO heterojunctions was mainly attributed to the internal electric field induced by spontaneous polarization effect in ZnO layer. |
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