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Low-Voltage-Operated Highly Sensitive Graphene Hall Elements by Ionic Gating

Authors
Kim, JoonggyuNa, JunhongJoo, Min-KyuSuh, Dongseok
Issue Date
Jan-2019
Publisher
AMER CHEMICAL SOC
Keywords
magnetic Hall sensor; low-voltage operation; ionic gating; graphene; Hall element array
Citation
ACS APPLIED MATERIALS & INTERFACES, v.11, no.4, pp.4226 - 4232
Journal Title
ACS APPLIED MATERIALS & INTERFACES
Volume
11
Number
4
Start Page
4226
End Page
4232
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/3882
DOI
10.1021/acsami.8b17869
ISSN
1944-8244
Abstract
The advanced Hall magnetic sensor using an ion-gated graphene field-effect transistor demonstrates a high current-normalized sensitivity larger than 3000 V/AT and low operation voltages smaller than 0.5 V. From commercially available grapheneon-SiO2 wafers, large-area arrays of ion-gated graphene Hall element (ig-GHE) samples are prepared through complementary metal-oxide-semiconductor-compatible fabrication processes except the final addition of ionic liquid electrolyte covering the exposed graphene channel and the separate gate-electrode area. The enhanced carrier tunability by ionic gating enables this ig-GHE device to be extremely sensitive to magnetic fields in low-voltage-operation regimes. Further electrical characterization indicates that the operation window is limited by the nonuniform carrier concentration over the channel under high bias conditions. The drain-current-normalized magnetic resolution of the device measured using the low-frequency noise technique is comparable to the previously reported values despite its significant low power consumption.
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