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Improved immunity to plasma damage in ultrathin nitrided oxides [CMOS technology]

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7 Author(s)
Chi-Chun Chen ; Inst. of Electron., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Horng-Chih Lin ; Chun-Yen Chang ; Mong-Song Liang
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Plasma-induced damage in various 3-nm thick gate oxides (i.e., pure O/sub 2/ and N/sub 2/O-nitrided oxides) was investigated by subjecting both nMOS and pMOS antenna devices to a photoresist ashing step after metal pad definition. Gate leakage current measurements indicated that large leakage current occurs at the wafer center as well as at the wafer edge for pMOS devices, while it occurs only at the wafer center for nWOS devices. These interesting observations could be explained by the polarity dependence of ultrathin oxides in charge-to-breakdown measurements. Additionally, ultrathin N/sub 2/O-nitrided oxides show superior immunity to charging damage, especially for pMOS devices.

Published in:

Electron Device Letters, IEEE  (Volume:21 ,  Issue: 1 )

Date of Publication:

Jan. 2000

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