Influence of metal contacts and charge inhomogeneity on transport properties of graphene near the neutrality point
By P. Blake, R. Yang, S. Morozov, F. Schedin, L. Ponomarenko, A. Zhukov, I. V. Grigorieva, K. Novoselov, A.K. Geim. 2008
189 citations recorded by the source corpus.
There is an increasing amount of literature concerning electronic properties of graphene close to the neutrality point. Many experiments continue using the two-probe geometry or invasive contacts or do not control samples' macroscopic homogeneity. We believe that it is helpful to point out some problems related to such measurements. By using experimental examples, we illustrate that the charge inhomogeneity induced by spurious chemical doping or metal contacts can lead to large systematic errors in assessing graphene's transport properties and, in particular, its minimal conductivity. The problems are most severe in the case of two-probe measurements where the contact resistance is found to strongly vary as a function of gate voltage. (C) 2009 Elsevier Ltd. All rights reserved.
Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/7d383dd26b4ae22b9ff3033c225bfa148bf2f0ce
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Citations in the corpus
- Dirac electronic states in graphene systems: optical spectroscopy studies (2010, background): “They offer a rather direct verification of electronic band structure in these materials and/or help to avoid the advanced sample processing of often invasive character [32].”
- Covalent Chemistry for Graphene Electronics (2011, background): “Journal of Physical Chemistry Letters, American Chemical Society, 2011, 2 (2487), pp.”
- Electronic transport in two-dimensional graphene (2010, background): “Although, it is not clear what role contact resistance (Blake et al., 2009; Blanter and Martin, 2007; Cayssol et al., 2009; Giovannetti et al., 2008; Golizadeh-Mojarad and Datta, 2009; Huard et al., 2008; Lee et al., 2008b) played in these 2-probe measurements.”
- Strong plasmonic enhancement of photovoltage in graphene. (2011, background): “Such p–n junctions are often created close to the contacts, because of the difference in the work functions of metal and graphen”
- Colloquium: The transport properties of graphene: An introduction (2010, background): “There are, however, difficulties associated with measuring the conductivity of graphene ribbons at the neutrality point (Blake et al., 2009), since inhomogeneous samples tend to overvalue the minimum of conductivity and two-probe measurements are generally expected to undervalue it (Blake et al.,…”