Infrared spectroscopy of large scale single layer graphene on self assembled organic monolayer

Nak Woo Kim; Joo Youn Kim; Chul Lee; Sang Jin Kim; Byung Hee Hong; E. J. Choi

doi:10.1063/1.4863416

Infrared spectroscopy of large scale single layer graphene on self assembled organic monolayer

Nak Woo Kim, Joo Youn Kim, Chul Lee, Sang Jin Kim, Byung Hee Hong, E. J. Choi

Department of Physics

Research output: Contribution to journal › Article › peer-review

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Abstract

We study the effect of self-assembled monolayer (SAM) organic molecule substrate on large scale single layer graphene using infrared transmission measurement on Graphene/SAM/SiO₂/Si composite samples. From the Drude weight of the chemically inert CH₃-SAM, the electron-donating NH₂-SAM, and the SAM-less graphene, we determine the carrier density doped into graphene by the three sources - the SiO₂ substrate, the gas-adsorption, and the functional group of the SAM's - separately. The SAM-treatment leads to the low carrier density N ∼ 4 × 10¹¹ cm^-2 by blocking the dominant SiO₂- driven doping. The carrier scattering increases by the SAM-treatment rather than decreases. However, the transport mobility is nevertheless improved due to the reduced carrier doping.

Original language	English
Article number	041904
Journal	Applied Physics Letters
Volume	104
Issue number	4
DOIs	https://doi.org/10.1063/1.4863416
State	Published - 27 Jan 2014

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title = "Infrared spectroscopy of large scale single layer graphene on self assembled organic monolayer",

abstract = "We study the effect of self-assembled monolayer (SAM) organic molecule substrate on large scale single layer graphene using infrared transmission measurement on Graphene/SAM/SiO2/Si composite samples. From the Drude weight of the chemically inert CH3-SAM, the electron-donating NH2-SAM, and the SAM-less graphene, we determine the carrier density doped into graphene by the three sources - the SiO2 substrate, the gas-adsorption, and the functional group of the SAM's - separately. The SAM-treatment leads to the low carrier density N ∼ 4 × 1011 cm-2 by blocking the dominant SiO2- driven doping. The carrier scattering increases by the SAM-treatment rather than decreases. However, the transport mobility is nevertheless improved due to the reduced carrier doping.",

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AU - Woo Kim, Nak

AU - Youn Kim, Joo

AU - Lee, Chul

AU - Jin Kim, Sang

AU - Hee Hong, Byung

AU - Choi, E. J.

PY - 2014/1/27

Y1 - 2014/1/27

N2 - We study the effect of self-assembled monolayer (SAM) organic molecule substrate on large scale single layer graphene using infrared transmission measurement on Graphene/SAM/SiO2/Si composite samples. From the Drude weight of the chemically inert CH3-SAM, the electron-donating NH2-SAM, and the SAM-less graphene, we determine the carrier density doped into graphene by the three sources - the SiO2 substrate, the gas-adsorption, and the functional group of the SAM's - separately. The SAM-treatment leads to the low carrier density N ∼ 4 × 1011 cm-2 by blocking the dominant SiO2- driven doping. The carrier scattering increases by the SAM-treatment rather than decreases. However, the transport mobility is nevertheless improved due to the reduced carrier doping.

AB - We study the effect of self-assembled monolayer (SAM) organic molecule substrate on large scale single layer graphene using infrared transmission measurement on Graphene/SAM/SiO2/Si composite samples. From the Drude weight of the chemically inert CH3-SAM, the electron-donating NH2-SAM, and the SAM-less graphene, we determine the carrier density doped into graphene by the three sources - the SiO2 substrate, the gas-adsorption, and the functional group of the SAM's - separately. The SAM-treatment leads to the low carrier density N ∼ 4 × 1011 cm-2 by blocking the dominant SiO2- driven doping. The carrier scattering increases by the SAM-treatment rather than decreases. However, the transport mobility is nevertheless improved due to the reduced carrier doping.

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Infrared spectroscopy of large scale single layer graphene on self assembled organic monolayer

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