Coulomb Scattering Controlled by Ionized Molecules Adsorbed on Graphene

Akihisa Takai, Hidenori Goto, Hidehiko Akiyoshi, Lei Zhi, Misuzu Kitahara, Hideki Okamoto, Ritsuko Eguchi, Yukihiro Yoshida, Gunzi Saito, Yoshihiro Kubozono

Research output: Contribution to journalArticlepeer-review

Abstract

The transport property of graphene is significantly affected by molecular adsorption. When an electron is transferred between graphene and a molecule, charge carriers in graphene are scattered by the ionized molecules to decrease the mobility. The Coulomb scatterer is generally treated as a point charge, and the spatial extent of the molecule has rarely been discussed, although the effect may be important in large molecules. Here, we compare the scattering strengths of various electron-acceptor molecules by depositing them on graphene. As a result, molecules with lower symmetry and larger size enhance the scattering. These molecules can cause backscattering of carriers, increase the scattering cross section, and form aggregates in a random structure, all of which can intensify Coulomb scattering. In addition, the charged molecule does not decrease the mobility in the initial stage of the molecular deposition. The result is explained by the cancellation of the impurity charges in the SiO2/Si substrate by ionized molecules. Thus, the deposition of suitable molecules enables us to control the electronic properties of the atomic-layered materials.

Original languageEnglish
Pages (from-to)467-473
Number of pages7
JournalJournal of Physical Chemistry C
Volume128
Issue number1
DOIs
Publication statusPublished - Jan 11 2024

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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