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Conduction Mechanisms and Breakdown Characteristics of Al2O3-Doped ZrO2 High-k Dielectrics for Three-Dimensional Stacked Metal–Insulator–Metal Capacitors
This paper presents the results of I–V and constant-voltage-stress measurements on symmetrical dielectric ZrO2/Al2O3/ZrO2 film stacks of different thicknesses. The films were grown by atomic layer deposition and structured into cylindrical metal–insulator–metal capacitors. The temperaturedependent leakage characteristics and time-dependent dielectric breakdown behaviors were investigated. A correlation was found between the structural composition, the defect density, and the conduction mechanism.
Index Terms: High-k, leakage model, metal–insulator–metal (MIM) capacitor, reliability, ZrO2.
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