Journal
NANO ENERGY
Volume 69, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104472
Keywords
Two-dimensional materials; Graphene transistor; Neuromorphic devices; Memory device; Selector
Categories
Funding
- Samsung Research Funding & Incubation Center of Samsung Electronics [SRFC-MA1701-01]
- Korea Research Fellowship Program through the National Research Foundation of Korea - Ministry of Science and Innovation, ICT [NRF-2017H1D3A1A01013759]
- CREST [JPMJCR15F3]
- JST
- Singapore Ministry of Education Academic Research Fund Tier 2 grant [MOE2016-T2-2-141]
- MEXT, Japan
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To realize ultrafast and energy-efficient electronic devices, reducing the switching voltage slope for ON and OFF states that scales the supply voltage and device dimensions is critical. Novel device architectures based on two-dimensional (2D) materials have overcome the fundamental thermionic limit of the switching slope (60 mV/dec); however, a versatile switching device required for highly integrated memory and neuromorphic applications has not been achieved with such exceptional switching slope characteristics. Here, we demonstrate a switching voltage slope down to 0.62 mV/dec in a threshold switching device based on a vertical heterojunction of silver/hexagonal boron nitride (h-BN)/graphene. The sub-1 mV/dec switching slope for the first time, maintaining a high ON/OFF ratio (up to 10(10)), originates from the unique coupling between the migrated silver atoms and the chemically-inert graphene electrode through the 2D insulating h-BN. Moreover, our original switching device enables the evolution from a conventional volatile (threshold switching) to non-volatile memristive state by adequate voltage spikes, which is ideal for selector applications in highly integrated crossbar array architecture and in a novel synaptic device for neuromorphic computing.
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