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Open Access Green as soon as Postprint is submitted to ZB.
Correlation between the O+ 2 induced electron emission coefficient and the removal rate of Cu impurities segregated at the SiO 2/Si interface.
Appl. Phys. Lett. 58, 2138-2140 (1991)
Sputter removal of thin overlayers of Cu on Si was studied using 10 keV O+ 2 primary ions at near-normal incidence. The decay length λ, which characterizes the exponential fall-off of the Cu signal, was found to depend upon the carrier type, the dopant concentration, the polarity and strength of the electric field above the (n type) samples, and the intensity of light directed at the (p type) samples, the λ values varying between 0.4 and 2.2 μm. A similar dependence on sample and bombardment parameters was observed for the ion-induced electron emission coefficient γ which ranged from 0.05 to 3 electrons/O+ 2 ion. The results suggest that the internal electrical field strength established in the ion-bombarded sample is largely determined by the effective rate of electron emission. The field strength across the oxide controls the transport of positively charged Cu impurities through this region and thus also determines the Cu removal rate.
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Publication type
Article: Journal article
Document type
Scientific Article
ISSN (print) / ISBN
0003-6951
e-ISSN
1077-3118
Journal
Applied Physics Letters
Quellenangaben
Volume: 58,
Issue: 19,
Pages: 2138-2140
Publisher
American Institute of Physics (AIP)
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Radiation Protection (ISS)