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Title: Contact-free sheet resistance determination of large area graphene layers by an open dielectric loaded microwave cavity

A method for contact-free determination of the sheet resistance of large-area and arbitrary shaped wafers or sheets coated with graphene and other (semi) conducting ultrathin layers is described, which is based on an open dielectric loaded microwave cavity. The sample under test is exposed to the evanescent resonant field outside the cavity. A comparison with a closed cavity configuration revealed that radiation losses have no significant influence of the experimental results. Moreover, the microwave sheet resistance results show good agreement with the dc conductivity determined by four-probe van der Pauw measurements on a set of CVD samples transferred on quartz. As an example of a practical application, correlations between the sheet resistance and deposition conditions for CVD graphene transferred on quartz wafers are described. Our method has a high potential as measurement standard for contact-free sheet resistance measurement and mapping of large area graphene samples.
Authors:
; ; ; ; ;  [1] ;  [1] ;  [2] ; ;  [3]
  1. Department of Materials, Imperial College London, South Kensington, London SW7 2AZ (United Kingdom)
  2. (United Kingdom)
  3. National Physical Laboratory, Hampton Road, Teddington TW11 0LW (United Kingdom)
Publication Date:
OSTI Identifier:
22412834
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHEMICAL VAPOR DEPOSITION; COMPARATIVE EVALUATIONS; CORRELATIONS; DIELECTRIC MATERIALS; ELECTRIC CONDUCTIVITY; GRAPHENE; LAYERS; MICROWAVE RADIATION; PROBES; QUARTZ; SEMICONDUCTOR MATERIALS; SHEETS