Journal
2D MATERIALS
Volume 8, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/ac1ada
Keywords
ferroelectrics; semiconductors; two-dimensional materials; electron transport; photoresponse
Categories
Funding
- European Union
- Engineering and Physical Sciences Research Council [EP/M012700/1]
- EPSRC [EP/M012700/1] Funding Source: UKRI
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The study presents a novel ferroelectric semiconductor junction, utilizing ferroelectric vdW semiconductor embedded between two graphene electrodes to achieve nano-ferroelectric effects. By controlling applied voltages and/or light, the memristive effects of these two-terminal devices can be modulated. The research uncovers the conduction mechanisms and demonstrates potential pathways for future developments of FSJs.
The miniaturization of ferroelectric devices offers prospects for non-volatile memories, low-power electrical switches and emerging technologies beyond existing Si-based integrated circuits. An emerging class of ferroelectrics is based on van der Waals (vdW) two-dimensional materials with potential for nano-ferroelectrics. Here, we report on ferroelectric semiconductor junctions (FSJs) in which the ferroelectric vdW semiconductor alpha-In2Se3 is embedded between two single-layer graphene electrodes. In these two-terminal devices, the ferroelectric polarization of the nanometre-thick In2Se3 layer modulates the transmission of electrons across the graphene/In2Se3 interface, leading to memristive effects that are controlled by applied voltages and/or by light. The underlying mechanisms of conduction are examined over a range of temperatures and under light excitation revealing thermionic injection, tunnelling and trap-assisted transport. These findings are relevant to future developments of FSJs whose geometry is well suited to miniaturization and low-power electronics, offering opportunities to expand functionalities of ferroelectrics by design of the vdW heterostructure.
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