Charge dynamics and electronic structures of monolayer graphene with molecular doping

C. C. Shen, C. T. Lin, Lain-Jong Li, H. L. Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

THz absorption and spectroscopic ellipsometry were used to investigate the charge dynamics and electronic structures of monolayer graphene with doping by triazine. The absorption spectrum of the triazine-doped film shows an optical excitation near 5.1 eV that is blue shifted compared with that of undoped analog. THz conductivity displays a coherent response of itinerant charge carriers at zero frequency and a disorder-induced finite frequency peak around 155 cm -1. Drude plasma frequency (∼4400 cm -1) decreases with decreasing temperature while carrier relaxation time (∼13 fs) is almost temperature independent, implying the semiconducting behavior with thermal activation energy of 3 meV.

Original languageEnglish (US)
Article number111907
JournalApplied Physics Letters
Volume101
Issue number11
DOIs
StatePublished - Sep 10 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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