The dielectric strength of an oxide layer is the electric field level at which the material fails as an insulator.
Understanding Oxide Dielectric Strength
For an oxide layer, the dielectric strength is often expressed in terms of the electric field at which the insulator is irreversibly damaged and has lost its insulating properties. This critical electric field represents the maximum field the oxide can withstand before electrical breakdown occurs.
Measurement and Determining Breakdown Parameters
Determining the dielectric strength of an oxide involves measuring its breakdown parameters. Due to the nature of dielectric breakdown, there are several test methods used for this measurement. These methods vary depending on the way the stress voltage or stress current are applied to the oxide layer. The specific method used can influence the measured value of the dielectric strength.
Because the dielectric strength is material-dependent (e.g., silicon dioxide, aluminum oxide, etc.) and can also be affected by factors like thickness, processing, and defects, there isn't a single universal numerical value for "dielectric strength of oxide" that applies to all oxides and conditions. Instead, it is a characteristic property measured for a specific oxide material under defined conditions.
