Temperature effect on the electronic structure of Nb:SrTiO3 (100) surface

doi:10.1088/1674-1056/24/2/027901

Abstract The effect of temperature on the electronic structure of Nb-doped SrTiO₃ (100) surface is investigated by high-resolution synchrotron radiation photoemission spectroscopy. According to the x-ray photoemission spectroscopy (XPS) results, at an annealing temperature of less than 700 ℃, the adsorbed carbon and hydroxyl on the STO surface could be removed, to expose the fresh intrinsic surface with a constant ratio of Ti/O. It is obvious that the STO would be doped by Ca⁺ impurities of bulks and O vacancies in the surface after annealing at 920 ℃ for one hour.

Keywords: strontium titanate ultrahigh vacuum annealing synchrotron radiation photoemission spectroscopy

Received: 09 June 2014
Revised: 30 September 2014
Published: 05 February 2015

PACS:	79.60.-i	(Photoemission and photoelectron spectra)
	73.20.At	(Surface states, band structure, electron density of states)
	81.65.Cf	(Surface cleaning, etching, patterning)

Fund: Project supported by the Funds from the Chinese Academy of Sciences (Grant No. 1G2009312311750101) and the National Natural Science Foundation of China (Grant No. 11375228).

Corresponding Authors: Wang Jia-Ou
E-mail: wangjo@ihep.ac.cn

Cite this article:

Zhang Shuang-Hong, Wang Jia-Ou, Qian Hai-Jie, Wu Rui, Zhang Nian, Lei Tao, Liu Chen, Kurash Ibrahim Temperature effect on the electronic structure of Nb:SrTiO₃ (100) surface 2015 Chin. Phys. B 24 027901

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