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Detection of Border Trap Density and Energy Distribution Along the Gate Dielectric Bulk of High- \kappa Gated MOS Devices

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5 Author(s)
Chun-Yuan Lu ; Dept. of Eng. & Syst. Sci., Nat. Tsing Hua Univ., Hsinchu ; Kuei-Shu Chang-Liao ; Chun-Chang Lu ; Tsai, Ping-Hung
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A novel charge-pumping (CP) technique is demonstrated to extract border-trap distribution for high- kappa gated MOSFETs. The varying-frequency CP method is shown to be more effective than the varying-amplitude one for probing border traps and extending the tunneling depth. A linear relationship of the Qcp versus ln(T rTf)1/2 plot can only be maintained at the CP frequency of 1 MHz, while not below 1 MHz, due to the influence of border traps near HfOxNy/Si interface. The proposed technique, which takes into consideration the effect of carrier tunneling in slow oxide traps, is used successfully to obtain the spatial and energy dependence of bulk trap density in high-kappa bulk

Published in:

Electron Device Letters, IEEE  (Volume:28 ,  Issue: 5 )

Date of Publication:

May 2007

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