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From electroburning to sublimation: substrate and environmental effects in the electrical breakdown process of monolayer graphene

El Abbassi, Maria and Posa, Laszlo and Makk, Peter and Nef, Cornelia and Thodkar, Kishan and Halbritter, Andras and Calame, Michel. (2017) From electroburning to sublimation: substrate and environmental effects in the electrical breakdown process of monolayer graphene. Nanoscale, 9 (44). pp. 17312-17317.

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Official URL: http://edoc.unibas.ch/58415/

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Abstract

We report on the characterization of the electrical breakdown (EB) process for the formation of tunneling nanogaps in single-layer graphene. In particular, we investigated the role of oxygen in the breakdown process by varying the environmental conditions (vacuum and ambient conditions). We show that the density of oxygen molecules in the chamber is a crucial parameter that defines the physical breakdown process: at low density, the graphene lattice is sublimating, whereas at high density, the process involved is oxidation, independent of the substrate material. To estimate the activation energies of the two processes, we use a scheme which consists of applying voltage pulses across the junction during the breakdown. By systematically varying the voltage pulse length, and estimating the junction temperature from a 1D thermal model, we extract activation energies which are consistent with the sublimation of graphene under high vacuum and the electroburning process under air. Our study demonstrates that, in our system, a better control of the gap formation is achieved in the sublimation regime.
Faculties and Departments:05 Faculty of Science > Departement Physik
05 Faculty of Science > Departement Physik > Physik
UniBasel Contributors:Calame, Michel and Makk, Peter and Schönenberger, Christian and El Abbassi, Maria
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:RSC Publishing
ISSN:2040-3364
e-ISSN:2040-3372
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:15 Jan 2018 10:30
Deposited On:15 Jan 2018 10:30

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