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Electrical Properties of Low- V_{T} Metal-Gated n-MOSFETs Using \hbox {La}_{2}\hbox {O}_{3}/\hbox {SiO}_{x} as Interfacial Layer Between HfLaO High- \kappa Dielectrics and Si Channel

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14 Author(s)
S.Z.Chang ; Taiwan Semicond. Manuf. Co., Hsinchu ; Yu, H.Y. ; Adelmann, C. ; Delabie, A.
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In this letter, we report that by employing the La2O3/SiOx interfacial layer between HfLaO (La = 10%) high- and Si channel, the Ta2C metal-gated n-MOSFETs VT can be significantly reduced by ~350 mV to 0.2 V, satisfying the low-Vy device requirement. The resultant n-MOSFETs also exhibit an ultrathin equivalent oxide thickness (~1.18 nm) with a low gate leakage (JG = 10 mA/cm2 at 1.1 V), good drive performance (Ion = 900 muA/mum at Isoff = 70 nA/mum), and acceptable positive-bias-temperature-instability reliability.

Published in:

Electron Device Letters, IEEE  (Volume:29 ,  Issue: 5 )

Date of Publication:

May 2008

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