Contactless probing of graphene charge density variation in a controlled humidity environment

The electronic properties of graphene are highly sensitive to atoms and molecules adsorbed on its surface and to changes in its environment, such as temperature and humidity. In this paper, we examine the effect of humidity on the local carrier concentration of different types of graphene prepared b...

Full description

Saved in:
Bibliographic Details
Published inCarbon (New York) Vol. 163; pp. 408 - 416
Main Authors Brown, Karl, Vincent, Tom, Castanon, Eli G., Rus, Florina S., Melios, Christos, Kazakova, Olga, Giusca, Cristina E.
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 15.08.2020
Elsevier BV
Subjects
Carrier density
Charge density
Chemical vapor deposition
Comparative studies
Doping
Epitaxial growth
Graphene
Humidity
Mechanical properties
Raman spectroscopy
Vector analysis
Online AccessGet full text

Cover

More Information
Summary:The electronic properties of graphene are highly sensitive to atoms and molecules adsorbed on its surface and to changes in its environment, such as temperature and humidity. In this paper, we examine the effect of humidity on the local carrier concentration of different types of graphene prepared by mechanical exfoliation, chemical vapour deposition and epitaxial growth on SiC, using in-situ Raman spectroscopy. We present a systematic and comparative study of the changes in Raman response using a vector analysis method to produce spatial maps of doping variation as a function of humidity. We also quantify the humidity induced carrier concentration change for different types of graphene. This study illustrates the effects of humidity on the electronic properties of graphene and provides a simple, contactless and quantitative method to directly evaluate water-induced doping effects in graphene, that are crucial for tailored device performance. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2020.03.037