Modeling Multilayer Thin Barrier Degradation under Coupled Thermo-Electric Stresses
Multilayer barrier longevity requires modeling field-assisted oxygen vacancy drift alongside thermal kinetics to prevent localized dielectric breakdown.
Poole Frenkel Conduction
Meaning
Charge transport mechanism explains the movement of electrons through an insulator when thermal energy and high field strength work together. Semiconductor scientists use poole frenkel conduction to quantify the unintended leakage in high dielectric constant stacks. Trap sites within the bandgap serve as temporary resting spots for carriers.
Trap Emission
Thermal excitation provides the necessary energy boost to push a trapped electron into the conductive band. In the regime of poole frenkel conduction, the rate of transfer increases exponentially with the square root of the electric field. This behavior distinguishes it from simple resistive heat flow.
Current Density
Leakage levels depend on the density of existing defects inside the thin film layers. Because poole frenkel conduction is very sensitive to heat, the insulation quality of devices improves when operating temperatures are kept low. High trap concentrations make this the dominant current path in poor films.
Device Limitation
Limits on miniaturization are set partly by the need to suppress these thermal leakage paths. When designers encounter poole frenkel conduction in testing, they must investigate the anneal process to fix atomic traps. Accurate modeling ensures that standby power consumption remains within the thresholds required by energy standards in the market.
Verification of the current slopes during variable temperature tests proves the conduction type.