Infrared spectroscopy of large scale single layer graphene on self assembled organic monolayer
- Kim, Nak Woo; Kim, Joo Youn; Lee, Chul; Kim, Sang Jin; Hong, Byung Hee; Choi, E. J.
- Issue Date
- Applied Physics Letters, Vol.104 No.4, p. 041904
- 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 similar to 4 x 10(11) 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. (C) 2014 AIP Publishing LLC.
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