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Characterisation of electron traps in high-k dielectric stacks for Flash memory applications using fast pulse techniques

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4 Author(s)
Zhang, W.D. ; Sch. of Eng., Liverpool John Moores Univ., Liverpool, UK ; Robinson, C. ; Zheng, X.F. ; Zhang, J.F.

High-κ dielectric stacks have been used to replace the conventional SiO2-based dielectric stacks in Flash memory cells in the 20 nm technology generation. The electron trap density in high-κ layers is orders of magnitude higher than that in SiO2, which introduces fast transient trapping/detrapping and affects the program/erase, retention and endurance of memory cells. Several fast pulse techniques have been developed to characterize electron traps throughout the dielectric stack, including 2-pulse and multi-pulse C-V and I-V techniques. These techniques are compared in this work and electron trapping in the high-κ stacks and its impact on memory cell performances are evaluated using these techniques.

Published in:

Solid-State and Integrated Circuit Technology (ICSICT), 2012 IEEE 11th International Conference on

Date of Conference:

Oct. 29 2012-Nov. 1 2012

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