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Title: Controlled, low-temperature nanogap propagation in graphene using femtosecond laser patterning
Authors: Maurice, Ange
Bodelot, Laurence
Tay, Beng Kang
Lebental, Bérengère
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Maurice, A., Bodelot, L., Tay, B. K., & Lebental, B. (2018). Controlled, low-temperature nanogap propagation in graphene using femtosecond laser patterning. Small, 14(31), 1801348-. doi:10.1002/smll.201801348
Journal: Small
Abstract: Graphene nanogap systems are promising research tools for molecular electronics, memories, and nanodevices. Here, a way to control the propagation of nanogaps in monolayer graphene during electroburning is demonstrated. A tightly focused femtosecond laser beam is used to induce defects in graphene according to selected patterns. It is shown that, contrary to the pristine graphene devices where nanogap position and shape are uncontrolled, the nanogaps in prepatterned devices propagate along the defect line created by the femtosecond laser. Using passive voltage contrast combined with atomic force microscopy, the reproducibility of the process with a 92% success rate over 26 devices is confirmed. Coupling in situ infrared thermography and finite element analysis yields a real-time estimation of the device temperature during electrical loading. The controlled nanogap formation occurs well below 50 °C when the defect density is high enough. In the perspective of graphene-based circuit fabrication, the availability of a cold electroburning process is critical to preserve the full circuit from thermal damage.
ISSN: 1613-6810
DOI: 10.1002/smll.201801348
Rights: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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