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Synthesis of Hierarchical ZnO/CdSSe Heterostructure Nanotrees

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Growth Control of InP/ZnSe Heterostructured Nanocrystals.

Doyoon Shin¹, Hak June Lee¹, Dongju Jung¹

¹SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)

|February 1, 2024

Summary

Researchers controlled the morphology of heavy-metal-free semiconductor nanocrystals (h-NCs). This advancement enables tailored photophysical properties for enhanced photonic applications.

Keywords:

InP/ZnSe heterostructured nanocrystals carrier dynamics shape control surface energy

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Area of Science:

Materials Science
Nanotechnology
Solid-State Physics

Background:

The morphology of heterostructured semiconductor nanocrystals (h-NCs) is critical for charge carrier dynamics and performance in photonic devices.
Controlling the morphology of heterovalent III-V/II-VI h-NCs, especially heavy-metal-free ones, remains a significant challenge for practical applications.

Purpose of the Study:

To demonstrate control over the growth of ZnSe epilayers on InP nanocrystals (NCs) as a case study for III-V/II-VI h-NCs.
To investigate the facet-dependent growth mechanisms influencing the anisotropic morphology of InP/ZnSe h-NCs.
To leverage controlled morphology for expanding the photophysical characteristics of h-NCs.

Main Methods:

Facet-dependent epitaxial growth studies of ZnSe on InP NCs.
Chemical methods to modulate ZnSe growth rates on different InP facets.
Characterization of resulting h-NC morphology and photophysical properties.

Main Results:

Anisotropic morphology in InP/ZnSe h-NCs was achieved and attributed to facet-dependent growth energetics.
Effective chemical strategies were developed to control ZnSe growth rates on specific InP surface planes.
The controlled morphology led to expanded photophysical characteristics, shifting from stable emission to environment-sensitive emission.

Conclusions:

The study successfully demonstrates control over the morphology of heavy-metal-free III-V/II-VI h-NCs.
Tailored morphology of InP/ZnSe h-NCs enables tuning of photophysical properties for diverse photonic applications.
This work paves the way for the practical implementation of advanced h-NCs in photonic technologies.