Journal article
Conductivity mapping of graphene on polymeric films by terahertz time-domain spectroscopy
Department of Micro- and Nanotechnology, Technical University of Denmark1
Nanocarbon, Department of Micro- and Nanotechnology, Technical University of Denmark2
Chinese Academy of Sciences3
University of California at San Diego4
Technical University of Denmark5
Department of Photonics Engineering, Technical University of Denmark6
Center for Nanostructured Graphene, Centers, Technical University of Denmark7
Fast inline characterization of the electrical properties of graphene on polymeric substrates is an essential requirement for quality control in industrial graphene production. Here we show that it is possible to measure the sheet conductivity of graphene on polymer films by terahertz time-domain spectroscopy (THz-TDS) when all internally reflected echoes in the substrate are taken into consideration.
The conductivity measured by THz-TDS is comparable to values obtained from four point probe measurements. THz-TDS maps of 25x30 cm2 area graphene films were recorded and the DC conductivity and carrier scattering time were extracted from the measurements. Additionally, the THz-TDS conductivity maps highlight tears and holes in the graphene film, which are not easily visible by optical inspection.
| Language: | English |
|---|---|
| Year: | 2018 |
| Pages: | 17748-17754 |
| ISSN: | 10944087 |
| Types: | Journal article |
| DOI: | 10.1364/OE.26.017748 |
| ORCIDs: | Whelan, Patrick Rebsdorf , Jepsen, Peter Uhd , Bøggild, Peter and 0000-0003-1114-2955 |
