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Inkjet-printed graphene Hall mobility measurements and low-frequency noise characterization

We report room temperature Hall mobility measurements, low temperature magnetoresistance analysis and low-frequency noise characterization of inkjet-printed graphene films on fused quartz and SiO 2 /Si substrates. We found that thermal annealing in vacuum at 450 °C is a necessary step in order to st...

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Bibliographic Details
Published in:Nanoscale 2020-03, Vol.12 (12), p.678-6716
Main Authors: Calabrese, Gabriele, Pimpolari, Lorenzo, Conti, Silvia, Mavier, Fabrice, Majee, Subimal, Worsley, Robyn, Wang, Zihao, Pieri, Francesco, Basso, Giovanni, Pennelli, Giovanni, Parvez, Khaled, Brooks, David, Macucci, Massimo, Iannaccone, Giuseppe, Novoselov, Kostya S, Casiraghi, Cinzia, Fiori, Gianluca
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Language:English
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Summary:We report room temperature Hall mobility measurements, low temperature magnetoresistance analysis and low-frequency noise characterization of inkjet-printed graphene films on fused quartz and SiO 2 /Si substrates. We found that thermal annealing in vacuum at 450 °C is a necessary step in order to stabilize the Hall voltage across the devices, allowing their electrical characterization. The printed films present a minimum sheet resistance of 23.3 Ω sq −1 after annealing, and are n-type doped, with carrier concentrations in the low 10 20 cm −3 range. The charge carrier mobility is found to increase with increasing film thickness, reaching a maximum value of 33 cm 2 V −1 s −1 for a 480 nm-thick film printed on SiO 2 /Si. Low-frequency noise characterization shows a 1/ f noise behavior and a Hooge parameter in the range of 0.1-1. These results represent the first in-depth electrical and noise characterization of transport in inkjet-printed graphene films, able to provide physical insights on the mechanisms at play. Inkjet printed graphene is in-depth investigated by means of Hall mobility measurements, low-temperature magnetoresistance analysis, and low frequency noise characterization.
ISSN:2040-3364
2040-3372
DOI:10.1039/c9nr09289g