期刊
JOURNAL OF APPLIED PHYSICS
卷 118, 期 18, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4935540
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资金
- 7th Framework Program of the European Union Collaborative Project ICT (Information and Communication Technologies) Planar Atomic and Molecular Scale Devices (PAMS) [FP7-610446]
- Foundation for Polish Science (FNP)
- European Regional Development Fund in the framework of the Polish Innovation Economy Operational Program [POIG.02.01.00-12-023/08]
To explore the origin of the Fermi level pinning in germanium, we investigate the Ge(001) and Ge(001): H surfaces. The absence of relevant surface states in the case of Ge(001): H should unpin the surface Fermi level. This is not observed. For samples with donors as majority dopants, the surface Fermi level appears close to the top of the valence band regardless of the surface structure. Surprisingly, for the passivated surface, it is located below the top of the valence band allowing scanning tunneling microscopy imaging within the band gap. We argue that the well known electronic mechanism behind band bending does not apply and a more complicated scenario involving ionic degrees of freedom is therefore necessary. Experimental techniques involve four point probe electric current measurements, scanning tunneling microscopy, and spectroscopy. (C) 2015 AIP Publishing LLC.
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