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Published on: October 23, 2018
Unveiling the Effect of Interfacial Structure on Hot Carrier Dynamics in Ag/ZnS Heterostructures through Interface
Feiyue Ge1,2, Zhihong Wei3,4, Xiaotian Bao5,6
1State Key Laboratory of Coordination Chemistry, School of Chemistry, Nanjing University, Nanjing 210023, China.
Researchers developed epitaxial silver/zinc sulfide heterostructures using a ligand-assisted method. This strategy enhances hot carrier transfer efficiency, crucial for advanced photoelectronic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Plasmon-induced hot carrier injection is key for metal/semiconductor heterostructures in photoelectronic applications.
- Lattice mismatch in these heterostructures complicates interfacial structure control and understanding hot carrier dynamics.
Purpose of the Study:
- To develop a method for creating epitaxial metal/semiconductor heterostructures with well-defined interfaces.
- To investigate the impact of epitaxial interfaces on plasmon-induced hot carrier dynamics and photoelectronic performance.
Main Methods:
- Ligand-assisted chemical transformation of Ag2S/ZnS templates to produce epitaxial Ag/ZnS heterostructures.
- Near-infrared transient absorption pump-probe spectroscopy to quantify hot electron transfer efficiency.
- Single-particle photothermal microscopy to analyze plasmonic heating characteristics.
Main Results:
- Achieved high-yield (>90%) epitaxial Ag/ZnS heterostructures with well-defined interfaces.
- Epitaxial interfaces significantly boosted hot electron transfer efficiency (38.12%) compared to non-epitaxial ones (21.11%).
- Photothermal signals showed uniform distribution and decreased intensity in epitaxial structures, correlating heating with interface quality.
Conclusions:
- Ligand-assisted synthesis enables precise control over interfacial atomic structures in metal/semiconductor heterostructures.
- Epitaxial interfaces are critical for optimizing plasmon-induced hot carrier dynamics and enhancing photoelectronic device performance.
- This approach provides valuable insights for designing high-performance optoelectronic devices based on plasmonic heterostructures.
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