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Effect of plasma poly etch on effective channel length and hot carrier reliability in submicron transistors

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7 Author(s)
Xiaoyu Li ; Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA ; Divakaruni, R. ; Jen-Tai Hsu ; Prabhakar, V.
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The effective channel length (L/sub eff/)) variation resulting from exposure to the plasma during the poly-etch step was investigated. The plasma induced charging effect was also studied using gate polysilicon antenna structures. It was found that, due to the poly etching, the L/sub eff/ variation has a larger impact on the fully processed transistor transconductance characteristics than the charging effect in the gate oxide region. It is believed that the damage in the LDD region, which gives rise to the L/sub eff/ variation, imposes a serious hot carrier reliability problem.<>

Published in:

Electron Device Letters, IEEE  (Volume:15 ,  Issue: 4 )

Date of Publication:

April 1994

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