TITLE

Characteristics of surface states and charge neutrality level in Ge

AUTHOR(S)
Kuzum, Duygu; Martens, Koen; Krishnamohan, Tejas; Saraswat, Krishna C.
PUB. DATE
December 2009
SOURCE
Applied Physics Letters;12/21/2009, Vol. 95 Issue 25, p252101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The characteristics of surface states on Ge are investigated using metal/insulator/semiconductor structures and the conductance technique. Evidence of acceptor-like and donor-like surface states on the valence band side of the Ge bandgap is shown by trap time constant analysis. The dependency of trap time constants on trap energy separation from band edge, capture cross section, and temperature are studied through conductance measurements and simulations. The effect of surface states on the location of charge neutrality level at the Ge surface and the consequences such as surface conductivity and negative charge buildup at the interface are discussed.
ACCESSION #
47132881

 

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