Gate-Tunable Dirac Point of Molecular Doped Graphene

ACS Nano
Pablo Solís-FernándezHiroki Ago

Abstract

Control of the type and density of charge carriers in graphene is essential for its implementation into various practical applications. Here, we demonstrate the gate-tunable doping effect of adsorbed piperidine on graphene. By gradually increasing the amount of adsorbed piperidine, the graphene doping level can be varied from p- to n-type, with the formation of p-n junctions for intermediate coverages. Moreover, the doping effect of the piperidine can be further tuned by the application of large negative back-gate voltages, which increase the doping level of graphene. In addition, the electronic properties of graphene are well preserved due to the noncovalent nature of the interaction between piperidine and graphene. This gate-tunable doping offers an easy, controllable, and nonintrusive method to alter the electronic structure of graphene.

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Citations

Mar 1, 2017·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Simin FengMauricio Terrones
Oct 31, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Minglei SunUdo Schwingenschlögl
Apr 8, 2021·The Journal of Physical Chemistry. a·Rabindranath LoPavel Hobza
Mar 13, 2019·ACS Nano·Gangamallaiah VelpulaSteven De Feyter
Jul 22, 2018·Nano Letters·José M CaridadMads Brandbyge
Dec 12, 2018·Nano Letters·Tetsuhiko F TeshimaYuko Ueno

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