Valence band offset of ZnO/BaTiO3 heterojunction measured by X-ray photoelectron spectroscopy

X-ray photoelectron spectroscopy has been used to measure the valence band offset of the ZnO/BaTiO3 heterojunction grown by metal-organic chemical vapor deposition. The valence band offset (VBO) is determined to be 0.48 +/- 0.09 eV, and the conduction band offset (CBO) is deduced to be about 0.75 eV using the band gap of 3.1 eV for bulk BaTiO3. It indicates that a type-II band alignment forms at the interface, in which the valence and conduction bands of ZnO are concomitantly higher than those of BaTiO3. The accurate determination of VBO and CBO is important for use of semiconductor/ferroelectric heterojunction multifunctional devices.

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Approved for entry into archive by 阎军(yanj@red.semi.ac.cn) on 2010-06-04T14:37:17Z (GMT) No. of bitstreams: 1 Valence band offset of ZnOBaTiO3 heterojunction measured by X-ray photoelectron spectroscopy.pdf: 368346 bytes, checksum: c5a43aade3c3b0b1e42f3ff469fb5cf9 (MD5)

Made available in DSpace on 2010-06-04T14:37:17Z (GMT). No. of bitstreams: 1 Valence band offset of ZnOBaTiO3 heterojunction measured by X-ray photoelectron spectroscopy.pdf: 368346 bytes, checksum: c5a43aade3c3b0b1e42f3ff469fb5cf9 (MD5) Previous issue date: 2010

This work was supported by the 973 program (2006CB604908, 2006CB921607), and the National Natural Science Foundation of China (60625402, 60990313).

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This work was supported by the 973 program (2006CB604908, 2006CB921607), and the National Natural Science Foundation of China (60625402, 60990313).