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Engineering of Exciton Spatial Distribution in CdS Nanoplatelets
Yan Zhang1, Haibing Zhang2, Dongdong Chen2
1State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
Nano Letters
|June 11, 2021
Summary
Synthesized sulfur-terminated cadmium sulfide (CdS) nanoplatelets exhibit tunable band gaps influenced by surface termination. This controlled surface engineering allows for precise manipulation of exciton behavior in semiconductor nanocrystals.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Semiconductor nanocrystals offer tunable optoelectronic properties.
- Controlling surface termination is crucial for nanocrystal performance.
- Previous studies focused on cadmium-terminated CdS nanoplatelets.
Purpose of the Study:
- To synthesize and characterize sulfur-terminated CdS nanoplatelets.
- To investigate the influence of surface termination on band gap and optical properties.
- To demonstrate the engineering of exciton spatial distribution via surface control.
Main Methods:
- Synthesis of zinc-blende CdS nanoplatelets with {100} basal planes.
- Surface termination achieved with either Cd or S atoms.
- Characterization using optical spectroscopy, X-ray diffraction, X-ray absorption, and transmission electron microscopy.
Main Results:
- Atomically flat, large {100} basal planes were synthesized for both Cd- and S-terminated CdS nanoplatelets.
- Band gaps were found to depend on both quantum confinement (thickness) and surface termination.
- Surface termination influenced ligand packing, lattice strain, and optical spectral width.
Conclusions:
- Tailored synthesis of semiconductor nanocrystals with controlled surface structures is achievable.
- Engineering exciton spatial distribution is possible through precise surface control.
- This opens new avenues for realizing the potential of semiconductor nanocrystals.
