Controllable Synthesis of 2H-1T' Mo

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Transition metal dichalcogenides (TMDs) are crucial for optoelectronic devices.
• Improving TMD optoelectronic properties often involves heterostructure construction and doping.
• Chemical vapor deposition (CVD) is an efficient method for heterostructure synthesis.

Purpose of the Study:

• To develop a one-step CVD method for synthesizing alloy-to-alloy lateral heterostructures.
• To investigate the optoelectronic properties of 2H-1T' MoxRe(1-x)S2 heterostructures.
• To explore the potential applications of these heterostructures in optoelectronic devices.

Main Methods:

• One-step chemical vapor deposition (CVD) growth of 2H-1T' MoxRe(1-x)S2 alloy-to-alloy lateral heterostructures.
• Utilizing cross-contamination and differential growth temperatures for material synthesis.
• Characterization of optoelectronic properties including response rejection ratio and photoconductivity effects (PPC and NPC).

Main Results:

• Successfully synthesized 2H-1T' MoxRe(1-x)S2 alloy-to-alloy lateral heterostructures via one-step CVD.
• Observed a high response rejection ratio in the solar-blind ultraviolet (SBUV) region for 2H MoxRe(1-x)S2 with a positive photoconductive (PPC) effect.
• Demonstrated a negative photoconductivity (NPC) effect for 1T' MoxRe(1-x)S2 under UV irradiation.
• Showcased gate voltage tunability of optoelectronic properties in the heterostructures.

Conclusions:

• The one-step CVD method enables simultaneous doping and alloy heterostructure formation in TMDs.
• The synthesized 2H-1T' MoxRe(1-x)S2 heterostructures exhibit distinct optoelectronic behaviors (PPC and NPC).
• These findings offer potential for advanced optoelectronic devices and logic applications.