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Confining Metastable Wurtzite HgTe for Infrared Optoelectronics.

Kseniia A Sergeeva¹, Arsenii S Portniagin¹, Dario Mastrippolito²

¹Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong S.A.R. 999077, P. R. China.

|March 24, 2026

Summary

This summary is machine-generated.

Researchers synthesized metastable wurtzite (WZ) mercury telluride (HgTe) nanocrystals, enabling novel infrared optoelectronics. These WZ HgTe materials exhibit tunable optical properties and superior electroluminescence for advanced applications.

Keywords:

Dirac 3D semimetal HgTe infrared light-emitting diode nanocrystals pressure-induced phase transition wurtzite

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Mercury telluride (HgTe) nanocrystals are crucial for infrared optoelectronics.
Previously, only zinc blende phase HgTe was accessible.

Purpose of the Study:

To synthesize metastable wurtzite (WZ) HgTe nanocrystals.
To explore their unique structural, electronic, and optical properties.
To demonstrate their potential in infrared optoelectronics.

Main Methods:

Cation exchange synthesis route.
Structural and spectroscopic characterizations.
Ab initio modeling.
High-pressure studies.
Fabrication of light-emitting diodes.

Main Results:

Successfully synthesized WZ HgTe in spherical and nanorod forms.
WZ HgTe exhibits tunable optical properties and a distinct electronic topology.
Bulk WZ HgTe is a Dirac semimetal; quantum confinement opens a direct gap for infrared emission.
Demonstrated superior electroluminescence beyond 2 μm using WZ HgTe nanorod-based LEDs.
Confirmed the metastable nature of WZ HgTe with a phase transition under pressure.

Conclusions:

Wurtzite HgTe nanocrystals offer a new platform for infrared optoelectronics.
This work bridges topological semimetals and confined infrared emitters.
The developed synthesis route provides access to novel HgTe-based materials.