Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-09-13
Phys. Rev. B 84, 035421 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 3 figures
Scientific paper
10.1103/PhysRevB.84.035421
Temperature-dependent resistivity of graphene grown by chemical vapor deposition (CVD) is investigated. We observe in low mobility CVD graphene device a strong insulating behavior at low temperatures and a metallic behavior at high temperatures manifesting a non-monotonic in the temperature dependent resistivity.This feature is strongly affected by carrier density modulation. To understand this anomalous temperature dependence, we introduce thermal activation of charge carriers in electron-hole puddles induced by randomly distributed charged impurities. Observed temperature evolution of resistivity is then understood from the competition among thermal activation of charge carriers, temperature-dependent screening and phonon scattering effects. Our results imply that the transport property of transferred CVD-grown graphene is strongly influenced by the details of the environment
Chung Hyun-Jong
Chung U-In
Heo Junseong
Hwang Euyheon H.
Lee Sung-Hoon
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