Open Access Nano Express

Valence band offset of wurtzite InN/SrTiO3 heterojunction measured by x-ray photoelectron spectroscopy

Zhiwei Li*, Biao Zhang, Jun Wang, Jianming Liu, Xianglin Liu, Shaoyan Yang, Qinsheng Zhu and Zhanguo Wang

Author Affiliations

Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, People's Republic of China

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Nanoscale Research Letters 2011, 6:193  doi:10.1186/1556-276X-6-193

Published: 2 March 2011

Abstract

The valence band offset (VBO) of wurtzite indium nitride/strontium titanate (InN/SrTiO3) heterojunction has been directly measured by x-ray photoelectron spectroscopy. The VBO is determined to be 1.26 ± 0.23 eV and the conduction band offset is deduced to be 1.30 ± 0.23 eV, indicating the heterojunction has a type-I band alignment. The accurate determination of the valence and conduction band offsets paves a way to the applications of integrating InN with the functional oxide SrTiO3.