Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Contactless probing of graphene charge density variation in a controlled humidity environment
AU - Brown, K.
AU - Vincent, T.
AU - Castanon, E.G.
AU - Rus, F.S.
AU - Melios, C.
AU - Kazakova, O.
AU - Giusca, C.E.
PY - 2020/8/15
Y1 - 2020/8/15
N2 - 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.
AB - 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.
KW - Carrier concentration
KW - Chemical vapor deposition
KW - Electronic properties
KW - Humidity control
KW - Silicon carbide
KW - Chemical vapour deposition
KW - Comparative studies
KW - Controlled humidities
KW - Electronic properties of graphene
KW - In-situ Raman spectroscopy
KW - Mechanical exfoliation
KW - Quantitative method
KW - Temperature and humidities
KW - Graphene
U2 - 10.1016/j.carbon.2020.03.037
DO - 10.1016/j.carbon.2020.03.037
M3 - Journal article
VL - 163
SP - 408
EP - 416
JO - Carbon
JF - Carbon
SN - 0008-6223
ER -