On the origin of the electric carrier concentration in graphite

Details On the origin of the electric carrier concentration in graphite On the origin of the electric carrier concentration in graphite

2009-05-18

arxiv.org/abs/0905.2945v2

Phys. Rev. B 80, 195402 (2009)

Physics

Condensed Matter

Materials Science

11 pages, 4 figures

Scientific paper

We investigate the dependence of the electrical resistivity of $\sim 60 $nm thick single crystalline graphite samples on the defect concentration produced by proton irradiation at very low fluences. We show that the resistivity decreases few percent at room temperature after inducing defects at concentrations as low as $\sim 0.1 $ppm due to the increase in the carrier density, in agreement with theoretical estimates. The overall results indicate that the carrier densities measured in graphite are not intrinsic but related to defects and impurities.

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