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

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/SiO{sub 2}/Si composite samples. From the Drude weight of the chemically inert CH{sub 3}-SAM, the electron-donating NH{sub 2}-SAM, and the SAM-less graphene, we determine the carrier density doped into graphene by the three sources—the SiO{sub 2} substrate, the gas-adsorption, and the functional group of the SAM's—separately. The SAM-treatment leads to the low carrier density N ∼ 4 × 10{sup 11} cm{sup −2} by blocking the dominant SiO{sub 2}- 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.
Authors:
; ; ;  [1] ; ;  [2]
  1. Department of Physics, University of Seoul, Seoul 130-743 (Korea, Republic of)
  2. Department of Chemistry, Seoul National University, Seoul 151-742 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22280556
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; ADSORPTION; CARRIER DENSITY; CARRIER MOBILITY; CHANNELING; CHARGE CARRIERS; ELECTRONS; GRAPHENE; HETEROJUNCTIONS; INFRARED SPECTRA; INTERFACES; MOLECULES; SILICON; SILICON OXIDES; SUBSTRATES