Abstract-Graphene: Sub-Terahertz Frequency-Domain Spectroscopy Reveals Single-Grain Mobility and Scatter Influence of Large-Area Graphene

• http://onlinelibrary.wiley.com/doi/10.1002/adma.201570111/abstract

On page 2635, L. Bogani and co-workers measure the electronic response of individual domains in wafer-sized chemical vapor deposition (CVD) graphene by means of contactless sub-THz interferometry. The intrinsic optical conductance of graphene is observed and the remarkable mobility is shown to be mainly limited by charged scatterers on the substrate. This sensitivity of sub-THz interferometry to contaminants can be used to easily quantify their presence and assess the quality of large graphene structures, which is essential for applications in touchscreens, as well as wearable and optoelectronic devices.

Abstract-Sub-Terahertz Frequency-Domain Spectroscopy Reveals Single-Grain Mobility and Scatter Influence of Large-Area Graphene

1. Christian Cervetti¹, 
2. Eric Heintze¹, 
3. Boris Gorshunov^1,2,3, 
4. Elena Zhukova^1,2,3,
5. Svyatoslav Lobanov^2,3, 
6. Alexander Hoyer⁴,
7. Marko Burghard⁴, 
8. Klaus Kern^4,5, 
9. Martin Dressel¹ and
10. Lapo Bogani^1,†,*

Article first published online: 18 MAR 2015

http://onlinelibrary.wiley.com/doi/10.1002/adma.201500599/abstract

DOI: 10.1002/adma.201500599

© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

The response of individual domains in wafer-sized chemical vapor deposition graphene is measured by contactless sub-terahertz interferometry, observing the intrinsic optical conductance and reaching very high mobility values. It is shown that charged scatterers limit the mobility, validating previous theoretical predictions, and sub-terahertz quality assessment is demonstrated, as necessary for large-scale applications in touchscreens and wearable and optoelectronic devices.