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Giant Bandgap Reduction of Co3TeO6 via Pressure Engineering
Ying Chen1, Xiangdong Li2, Ke Liu3
1National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621900, Sichuan, China.
High pressure significantly reduces the bandgap of double perovskite cobalt tellurite (Co3TeO6), making it a promising material for solar cells. This high-pressure phase is stable at ambient conditions.
Area of Science:
- Materials Science
- Solid-State Physics
- Photovoltaics
Background:
- Double perovskites offer promising properties for various applications.
- Wide bandgaps in double perovskites limit their photovoltaic efficiency.
Purpose of the Study:
- To tune the bandgap energy of double perovskite cobalt tellurite (Co3TeO6) using high pressure.
- To investigate the structural and electronic property changes under pressure.
Main Methods:
- High-pressure treatment of Co3TeO6.
- Synchrotron-based X-ray diffraction and Raman spectroscopy for structural analysis.
- Bandgap energy measurement.
Main Results:
- A giant bandgap reduction of ~37% (from 2.93 to 1.85 eV) was achieved.
- Structural phase transitions occurred during compression and decompression.
- The reduced bandgap phase was quenchable to ambient conditions.
Conclusions:
- High pressure is an effective and green technique to tune the properties of Co3TeO6.
- Quenched Co3TeO6 is a potential light-harvesting material for photovoltaics.
- This method guides the search for stable, eco-friendly light-harvesting materials.
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