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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.
ACS Nano
|March 24, 2026
Summary
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.
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.
