Step tunneling enhanced asymmetry in metal-insulator-insulator-metal (MIIM) diodes for rectenna applications

N. Alimardani; J. F. Conley Jr.

doi:10.1117/12.2024750

25 September 2013 Step tunneling enhanced asymmetry in metal-insulator-insulator-metal (MIIM) diodes for rectenna applications

N. Alimardani, J. F. Conley Jr.

Author Affiliations +

Proceedings Volume 8824, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion IV; 88240S (2013) https://doi.org/10.1117/12.2024750
Event: SPIE Solar Energy + Technology, 2013, San Diego, California, United States

Abstract

We combine nanolaminate bilayer insulator tunnel barriers (Al₂O₃/HfO₂, HfO₂/Al₂O₃, Al₂O₃/ZrO₂) deposited via atomic layer deposition (ALD) with asymmetric work function metal electrodes to produce MIIM diodes with enhanced I-V asymmetry and non-linearity. We show that the improvements in MIIM devices are due to step tunneling rather than resonant tunneling. We also investigate conduction processes as a function of temperature in MIM devices with Nb₂O₅ and Ta₂O₅ high electron affinity insulators. For both Nb₂O₅ and Ta₂O₅ insulators, the dominant conduction process is established as Schottky emission at small biases and Frenkel-Poole emission at large biases. The energy depth of the traps that dominate Frenkel-Poole emission in each material are estimated.

Citation Download Citation

N. Alimardani and J. F. Conley Jr. "Step tunneling enhanced asymmetry in metal-insulator-insulator-metal (MIIM) diodes for rectenna applications", Proc. SPIE 8824, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion IV, 88240S (25 September 2013); https://doi.org/10.1117/12.2024750

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