Electrical and thermoelectric transport by variable range hopping in reduced graphene oxide
Artikel i vetenskaplig tidskrift, 2017

This study investigated the transport properties of single-layer reduced graphene oxides (rGOs). The rGOs were prepared by the bubble deposition method followed by thermal reduction. The crossover of the transport mechanism from Efros-Shklovskii (ES) variable range hopping (VRH) between the localized states to Mott-VRH was observed near 70K using the temperature-dependent conductance. The ES-VRH conduction below 70K is apparent in the electric field dependence of the field-driven hopping transport in the high-electric field regime. We also figure out that the thermoelectric power is consistent with the 2D Mott VRH above 70K. We argue that the VRH conduction results from the topological disorders of rGO as confirmed by Raman spectroscopy. This infers that the average distance between defects is approximately 2.0 nm.

Författare

M. Park

Seoul National University

Korea Institute of Science and Technology

S. J. Hong

Leibniz Universität Hannover

Kyung Ho Kim

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

H. Kang

Seoul National University

M. Lee

Seoul National University

D. H. Jeong

Seoul National University

YungWoo Park

Seoul National University

B. H. Kim

Incheon National University

Applied Physics Letters

0003-6951 (ISSN) 1077-3118 (eISSN)

Vol. 111 173103

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1063/1.4987021