Graphene-insulator-metal diodes: Enhanced dielectric strength of the Al2O3 barrier

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10487246" target="_blank" >RIV/00216208:11320/24:10487246 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=jlSBiF7Zpy" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=jlSBiF7Zpy</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/5.0223763" target="_blank" >10.1063/5.0223763</a>

Result language
angličtina
Original language name
Graphene-insulator-metal diodes: Enhanced dielectric strength of the Al2O3 barrier
Original language description
We studied the transport properties of graphene-insulator-metal tunneling diodes. Two sets of tunneling diodes with Ti-Cu and Cr-Au top contacts are fabricated. Transport measurements showed state-of-the-art non-linearity and a critical influence of the top metals on the dielectric strength of the tunneling barrier. X-ray photoelectron spectroscopy indicated two methods for enhancing the dielectric strength of the tunneling barrier. These are the optimized seed layers for the growth of high-quality conformal insulators and the selection of appropriate top metal layers with a small diffusion coefficient and electromigration into the Al(2)O(3) barrier. The Cr-Au top contact provides superior characteristics to the Ti-Cu metallization. X-ray photoelectron spectroscopy showed significant diffusion of titanium during the Al(2)O(3) growth and the formation of titanium inclusions after annealing. Chromium diffusion is slower than that of titanium, making chromium contact more suitable for the reliable operation of tunneling diodes. As a result, we demonstrate a 40% improvement in the dielectric strength of the tunneling barrier compared to state-of-the-art metal-insulator-metal diodes.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/GC21-28470J" target="_blank" >GC21-28470J: Ultra-fast rectifiers for time-resolved terahertz spectroscopy</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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