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New insights in polarity-dependent oxide breakdown for ultrathin gate oxide

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2 Author(s)
Wu, E. ; IBM Microelectron. Div., Essex Junction, VT, USA ; Sune, J.

In this work, a quantitative analysis is applied to resolve the newly reported polarity-dependent charge-to-breakdown (Q/sub BD/) data from thick oxides of 6.8 nm down to ultrathin oxides of 1.9 nm. Three independent sets of Q/sub BD/ data, i.e., n/sup +/poly/NFET stressed under inversion and accumulation, and p/sup +/ poly/PFET under accumulation are carefully investigated. The Q/sub BD/ degradation observed for p-type anodes, either poly-Si or Si-substrate, can be nicely understood with the framework of maximum energy released by injected electrons. Thus, this work provides a universal and quantitative account for a variety of experimental observations in the time-to-breakdown (T/sub BD/) and Q/sub BD/ polarity-dependence of oxide breakdown.

Published in:

Electron Device Letters, IEEE  (Volume:23 ,  Issue: 8 )

Date of Publication:

Aug. 2002

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