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MoS₂ P-type transistors and diodes enabled by high work function MoOx contacts.

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Summary

Substoichiometric molybdenum trioxide (MoOx) enables efficient hole injection into transition-metal dichalcogenides (TMDCs). This breakthrough facilitates high-performance p-type transistors and diodes, advancing TMDC electronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Developing low-resistance contacts for transition-metal dichalcogenides (TMDCs) is essential for high-performance electronic devices.
  • Efficient hole contacts are critical for fabricating p-type transistors using MoS2, a common TMDC.
  • Existing metal contacts lead to high Schottky barriers, hindering hole injection into MoS2.

Purpose of the Study:

  • To investigate substoichiometric molybdenum trioxide (MoOx) as an efficient hole injection layer for TMDCs.
  • To demonstrate the effectiveness of MoOx contacts in p-type field-effect transistors (FETs) and diodes based on MoS2 and WSe2.
  • To improve the performance of p-type TMDC transistors by overcoming limitations of conventional contact materials.

Main Methods:

  • Fabrication of MoS2 and WSe2 field-effect transistors and diodes utilizing MoOx as a contact material.
  • Characterization of device performance, including on-current and operational characteristics.
  • Comparison of MoOx contacts with conventional contact metals like Palladium (Pd) for p-type WSe2 FETs.

Main Results:

  • Substoichiometric molybdenum trioxide (MoOx, x < 3) effectively serves as a high work function hole injection layer for MoS2 and WSe2.
  • MoS2 p-type field-effect transistors and diodes were successfully fabricated using MoOx contacts.
  • Significant on-current enhancement was observed in p-type WSe2 FETs employing MoOx contacts compared to those with Pd contacts.

Conclusions:

  • MoOx represents a significant advancement in contact engineering for TMDCs, enabling efficient hole injection.
  • The use of MoOx contacts paves the way for exploring the ultimate performance limits and intrinsic transport properties of TMDCs.
  • This research facilitates the development of next-generation high-performance logic components based on TMDCs.