Abstract
We have investigated the intrinsic dielectric breakdown of gate oxide layers with thickness of 12 and 7 nm in n+ polycrystalline Si–SiO2–Si metal/oxide/semiconductor (MOS) capacitors after stress with constant current either under Fowler-Nordheim or under hot electron injection. Occurrence of soft breakdown without thermal damage in the MOS structure is demonstrated even in a 12 nm oxide under particular stress conditions. In general, it is found that the type of stress determines the breakdown mode (soft or hard).
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