Graphene mobility mapping

Jonas D. Buron; Filippo Pizzocchero; Peter U. Jepsen; Dirch H. Petersen; José M. Caridad; Bjarke S. Jessen; Timothy J. Booth; Peter Bøggild

doi:10.1038/srep12305

journal article Open Access Jul 24, 2015

Graphene mobility mapping

Jonas D. Buron Filippo Pizzocchero Peter U. Jepsen Dirch H. Petersen José M. Caridad Bjarke S. Jessen Timothy J. Booth

Peter Bøggild

Scientific Reports Vol. 5 No. 1 · Springer Science and Business Media LLC

View at Publisher Save 10.1038/srep12305

Abstract

AbstractCarrier mobility and chemical doping level are essential figures of merit for graphene and large-scale characterization of these properties and their uniformity is a prerequisite for commercialization of graphene for electronics and electrodes. However, existing mapping techniques cannot directly assess these vital parameters in a non-destructive way. By deconvoluting carrier mobility and density from non-contact terahertz spectroscopic measurements of conductance in graphene samples with terahertz-transparent backgates, we are able to present maps of the spatial variation of both quantities over large areas. The demonstrated non-contact approach provides a drastically more efficient alternative to measurements in contacted devices, with potential for aggressive scaling towards wafers/minute. The observed linear relation between conductance and carrier density in chemical vapour deposition graphene indicates dominance by charged scatterers. Unexpectedly, significant variations in mobility rather than doping are the cause of large conductance inhomogeneities, highlighting the importance of statistical approaches when assessing large-area graphene transport properties.

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Details

Published: Jul 24, 2015
Vol/Issue: 5(1)
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Authors

Department of Electrical and Photonics Engineering Technical University of Denmark DK‐2800 Kongens Lyngby Denmark

Cite This Article

Jonas D. Buron, Filippo Pizzocchero, Peter U. Jepsen, et al. (2015). Graphene mobility mapping. Scientific Reports, 5(1). https://doi.org/10.1038/srep12305

Graphene mobility mapping

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