All-metallic electrically gated 2H-TaSe₂ thin-film switches and logic circuits

Abstract

We report the fabrication and performance of all-metallic three-terminal devices with tantalum diselenide thin-film conducting channels. For this proof-of-concept demonstration, the layers of 2H-TaSe 2 were exfoliated mechanically from single crystals grown by the chemical vapor transport method. Devices with nanometer-scale thicknesses exhibit strongly non-linear currentvoltage characteristics, unusual optical response, and electrical gating at room temperature. We have found that the drain-source current in thin-film 2H-TaSe 2 -Ti/Au devices reproducibly shows an abrupt transition from a highly resistive to a conductive state, with the threshold tunable via the gate voltage. Such current-voltage characteristics can be used in principle for implementing radiation-hard all-metallic logic circuits. These results may open new application space for thin films of van der Waals materials.

Monolayer 1T-NbSe2 as a Mott insulator

“…The control of crystal phases via temperature has been used in the chemical vapor transport method to obtain 1T and 2H phases in some bulk TMDs. [31][32][33] Our results thus suggest that temperature control is a key factor for obtaining different crystal phases in both monolayer and bulk TMDs.…”

Structural, electronic and vibrational properties of few-layer 2H- and 1T-TaSe2

“…The electronic properties of these 2D nanocrystals range from insulating to semiconducting, metallic and even superconducting, and can differ dramatically from bulk crystals 1 . The versatility of these materials is shown by the wide range of reported applications including: electrocatalysts for hydrogen evolution 1 , opto- and spintronics 2 , electrodes and interconnects 3 4 , and electro-optical switch and data storage devices 5 .…”

Recent Advances in Two-Dimensional Materials with Charge Density Waves: Synthesis, Characterization and Applications

“…Recent breakthroughs in the synthesis techniques of 2D layered materials have facilitated the exploration of materials systems that were challenging in the past [1][2][3]. Transition metal dichalcogenides (TMDs) are a group of layered materials that has renewed interest due to their 2D confined structures [4,5].…”