期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 26, 页码 22623-22631出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b05577
关键词
2D materials; neuromorphic device; ionic liquid; transition metal oxides; ion migration
资金
- U.S. Department of Energy (DOE) [DE-SC0002136]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4416]
- U.S. DOE, Office of Basic Energy Sciences (BES), Materials Sciences and Engineering Division
- Laboratory Directed Research and Development Program of Oak Ridge National Laboratory
- U.S. DOE [DE-AC05-000R22725]
- Organized Research Unit Program at the University of Tennessee [ORU-IMHM-18]
The formation of an electric double layer in ionic liquid (IL) can electrostatically induce charge carriers and/or intercalate ions in and out of the lattice which can trigger a large change of the electronic, optical, and magnetic properties of materials and even modify the crystal structure. We present a systematic study of ionic liquid gating of exfoliated 2D molybdenum trioxide (MoO3) devices and correlate the resultant electrical properties to the electrochemical doping via ion migration during the IL biasing process. A nearly 9 orders of magnitude modulation of the MoO3 conductivity is obtained for the two types of ionic liquids that are investigated. In addition, notably rapid on/off switching was realized through a lithium-containing ionic liquid whereas much slower modulation was induced via oxygen extraction/intercalation. Time of flight-secondary ion mass spectrometry confirms the Li intercalation. Density functional theory (DFT) calculations have been carried out to examine the underlying metallization mechanism. Results of short-pulse tests show the potential of these MoO3 devices as neuromorphic computing elements due to their synaptic plasticity.
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