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Surface-Related Exciton and Lasing in CdS Nanostructures
Xian Gao1,2, Guotao Pang1, Zhenhua Ni3
1Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, People's Republic of China.
Nanoscale Research Letters
|June 27, 2019
Summary
Surface-related exciton (SX) emission dominates in cadmium sulfide (CdS) nanostructures, impacting their light-emitting properties. CdS nanobelts exhibit lasing, unlike nanowires, due to surface effects influencing performance.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Photoluminescence (PL) is crucial for understanding semiconductor nanostructures.
- Surface-to-volume ratio significantly influences optical properties of nanomaterials.
- Exciton dynamics and phonon interactions are key to optoelectronic device performance.
Purpose of the Study:
- To comparatively investigate the photoluminescence characteristics of CdS nanobelts (NBs) and nanowires (NWs).
- To analyze the role of surface-related exciton (SX) emission in CdS nanostructures.
- To explore the potential for lasing action in these nanostructures.
Main Methods:
- Power-dependent and temperature-dependent photoluminescence (PL) measurements.
- Comparative analysis of CdS nanobelts and nanowires.
- Investigation of exciton-phonon interactions and surface effects.
Main Results:
- SX emission plays a predominant role in both CdS NBs and NWs, correlating directly with surface-to-volume ratio.
- Exciton-phonon interaction is weaker in CdS NWs compared to CdS NBs.
- Lasing action was observed in CdS NBs at room temperature (threshold 608.13 mW/cm²), but not in CdS NWs due to surface-related detrimental effects.
Conclusions:
- SX emission significantly impacts the performance of CdS nanostructures for lasing and light-emitting applications.
- Surface effects, including thermal effects from deep-level transitions, hinder lasing in CdS NWs.
- CdS nanostructures' morphology critically influences their optoelectronic properties and potential applications.
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