Total-Dose-Induced Charge Buildup in Nitrided-Oxide MOS Devices
AEROSPACE CORP EL SEGUNDO CA EL SEGUNDO TECHNICAL OPERATIONS
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Nitrided oxides and reoxidized, nitrided oxides processed at various nitridation temperatures for various nitridation times have been irradiated. The total-dose response of these nitrided oxides has been analyzed and compared to that of radiation-hard control oxides. To aid in the analysis, the charge trapping model of Krantz et al. 1987 has been extended to include electron trapping and qualitatively applied to simulate the experimental results. Nitridation temperature was found to have a significant effect on the radiation response of thin -150 A nitrided oxides and reoxidized, nitrided oxides. The data show that oxides nitrided at 1050 deg C and reoxidized accumulate less fixed charge by a factor of -2 than the control oxides. Oxides nitrided at 950 deg C and reoxidized accumulate substantially more fixed charge by a factor of -5 than the controls or any of the nitrided samples. The analysis indicates that nitridation creates neutral hole traps as well as neutral electron traps, and that reoxidation can decrease the concentration of both hole and electron traps.
- Solid State Physics