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Copper-related degradation of SiO2 in metal–oxide–semiconductor capacitors subjected to bias thermal stress: Leakage of the minority charge carriers in the inversion layer

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4 Author(s)
Kohn, A. ; Department of Materials Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel ; Lipp, E. ; Eizenberg, M. ; Shacham-Diamand, Y.

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We describe a mechanism of Cu-related degradation of SiO2 in metal–oxide–semiconductor capacitors subjected to bias thermal stress (BTS). The commonly used stress of bias larger than 1 MV/cm at 300 °C results in increased oxide conductivity, which is large enough to enable the leakage of minority carrier charge generated at the inversion layer, while the oxide capacitance and high-frequency deep depletion capacitance can still be accurately measured. This is an intermediate degradation between the commonly reported flat-band voltage shifts and decrease in the breakdown voltage of the oxide. This phenomenon does not occur following BTS when the metallization is Al, or following thermal stress, even in Cu.

Published in:

Applied Physics Letters  (Volume:85 ,  Issue: 4 )

Date of Publication:

Jul 2004

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