Document Type

Article

Publication Date

11-2018

Publication Title

Physica E: Low-dimensional Systems and Nanostructures

Volume

107

Publisher

Elsevier

Abstract

Conductivity, carrier concentration and carrier mobility in graphene were investigated as a function of time in response to ionized donor and acceptor adsorbates. While a reduction in conductivity and hole density in graphene was observed upon exposure to a weak electron donor NH3, the carrier mobility was found to increase monotonically. The opposite behavior is observed upon exposure to NO2, which is expected based on its typical electron withdrawing property. Upon exposure to C9H22N2, a strong donor, it resulted in the transformation of graphene from p-type to n-type, although the inverse variation of carrier concentration and mobility was still observed. The variational trends remained unaltered even after intentional introduction of defects in graphene through exposure to oxygen plasma. The responses to C9H22N2, NH3 and NO2 exposures underline a strong influence by ionized surface adsorbates that we explained via a simple model considering charged impurity scattering of carriers in graphene.

Comments

This manuscript has been published in Physica E: Low-dimensional Systems and Nanostructures. Please find the published version here (note that a subscription is necessary to access this version):

https://www.sciencedirect.com/science/article/pii/S1386947718307756?via%3Dihub

https://doi.org/10.1016/j.physe.2018.11.021.

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