Voltage-dependent dielectric breakdown and voltage-controlled negative resistance in anodized [formula omitted] diodes
Journal of Applied Physics, ISSN: 1089-7550, Vol: 88, Issue: 5, Page: 2805-2812
2000
- 63Citations
- 23Captures
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Article Description
Theories of dielectric breakdown in insulating films normally assume that dielectric breakdown depends on the electric field in the sample; that is, the thicker the film the higher the breakdown voltage. Contrary to theoretical expectations, voltage-dependent dielectric breakdown is observed in [formula omitted] diodes where [formula omitted] is made by anodizing in different electrolytes. The breakdown voltage is [formula omitted] V, independent of [formula omitted] thickness and anodizing electrolyte. Voltage-controlled negative resistance (VCNR) develops in the current–voltage [formula omitted] characteristics of [formula omitted] diodes after voltage-dependent breakdown. Electron emission into vacuum accompanies the formation of VCNR in the [formula omitted] characteristics. Detailed studies of the development of VCNR show that the maximum current, the voltage for maximum current, and the voltage threshold for electron emission depend on the maximum voltage applied to the sample. A large current increase occurs for maximum applied voltage between 5 and 7 V. A fully developed VCNR characteristic has an ohmic contact suggesting that the development of an ohmic contact at a metal–insulator interface initiates breakdown. © 2000, American Institute of Physics. All rights reserved.
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