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Field enhancement induced by surface defects in two-dimensional ReSe2 field emitters
Filippo Giubileo1, Enver Faella2, Daniele Capista3
1CNR-SPIN Salerno, via Giovanni Paolo II n.132, 84084 Fisciano, Italy. filippo.giubileo@spin.cnr.it.
Nanoscale
|August 22, 2024
Summary
Rhenium diselenide (ReSe2) nanosheets exhibit excellent field emission properties. Their turn-on voltage is tunable, and they show high stability, making them suitable for electronic applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Mechanical exfoliation yields rhenium diselenide (ReSe2) nanosheets on Si/SiO2 substrates.
- Field emission is a crucial property for vacuum nanoelectronic devices.
Purpose of the Study:
- Investigate the field emission properties of ReSe2 nanosheets.
- Characterize their suitability as field emitters.
- Understand the influence of surface defects on emission.
Main Methods:
- Mechanical exfoliation for ReSe2 nanosheet preparation.
- Scanning electrode microscopy with nano-manipulated tungsten probes for n-type conduction confirmation.
- Finite element electrostatic simulations for electric field analysis.
- Current-voltage characteristic measurements.
Main Results:
- Confirmed n-type conduction in ReSe2 flakes.
- Demonstrated local characterization of field emission by controlling probe distance.
- Showed linear reduction of turn-on voltage with decreasing cathode-anode separation.
- Identified larger-than-expected effective field enhancement due to surface defects.
- Confirmed high time stability and low current fluctuations.
Conclusions:
- ReSe2 nanosheets are promising field emitters.
- Their field emission properties can be locally tuned.
- Surface defects play a significant role in field enhancement.
