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Two-Dimensional Atomically Thin Titanium Nitride via Topochemical Conversion.

Shan Lu¹, Jialin Li^2,3, Wanping Shen^1,4

¹State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.

|November 22, 2023

Summary

This summary is machine-generated.

Researchers synthesized large-area two-dimensional (2D) titanium nitride (TiN) nanosheets. These ultrathin TiN films exhibit thickness-dependent semiconducting properties and sensitive photoresponses, paving the way for novel electronic and optoelectronic devices.

Keywords:

UV irradiation photoresponse titanium nitride transition metal nitride two-dimensional materials

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Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Titanium nitride (TiN) is a transition metal nitride (TMN) with significant interest due to its unique properties and diverse applications.
The synthesis of two-dimensional (2D) atomically thin titanium nitride remains a significant challenge, limiting its exploration in advanced electronic and optoelectronic fields.

Purpose of the Study:

To develop a scalable method for producing large-area 2D titanium nitride nanosheets.
To investigate the electronic and optoelectronic properties of ultrathin titanium nitride, focusing on thickness-dependent transitions and photoresponse.

Main Methods:

In situ topochemical conversion of titanate monolayer to synthesize 2D titanium nitride.
Characterization of titanium nitride thickness, electronic properties, and photoresponse.
First-principles calculations to elucidate the mechanism behind photoinduced changes.

Main Results:

Successfully prepared large-area 2D titanium nitride with a thickness of approximately 1 nm.
Observed a thickness-dependent metallic-to-semiconducting transition, with ultrathin TiN exhibiting n-type semiconducting behavior.
Demonstrated a highly sensitive photoresponse and photoswitchable resistance in the 2D titanium nitride, attributed to light-induced oxygen desorption.

Conclusions:

The developed method enables scalable synthesis of ultrathin transition metal nitrides.
The findings reveal the potential of 2D titanium nitride for fundamental physics research and next-generation optoelectronic applications.
The photoswitchable resistance property opens avenues for light-controlled electronic devices.