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Strong passivation effects on the properties of an InAs surface quantum dot hybrid structure
A Lin1, B L Liang, V G Dorogan
1California NanoSystems Institute and Electrical Engineering Department, University of California at Los Angeles, CA 90095, USA.
Nanotechnology
|January 30, 2013
Summary
Surface passivation significantly alters InAs quantum dot (QD) hybrid structures, impacting photoluminescence and carrier tunneling. This sensitivity suggests potential for novel sensing applications.
Area of Science:
- Semiconductor Nanostructures
- Quantum Dot Physics
- Surface Science
Background:
- Quantum dot (QD) hybrid structures offer unique optoelectronic properties.
- Surface passivation is critical for controlling QD performance.
- Understanding surface effects is key to developing advanced QD devices.
Purpose of the Study:
- To investigate the impact of surface passivation on InAs QD hybrid structures.
- To analyze changes in photoluminescence (PL) and carrier dynamics.
- To explore the potential of these structures for sensing applications.
Main Methods:
- Fabrication of a three-layer InAs QD hybrid structure.
- Surface passivation using chemical treatment for 180 minutes.
- Photoluminescence (PL) spectroscopy to measure spectral shifts and intensity changes.
- Time-resolved PL to study carrier tunneling dynamics.
- Modeling with rate equations to interpret optical performance.
Main Results:
- Surface passivation caused a significant blue shift in the surface QD PL peak (1545 nm to 1275 nm).
- PL intensity decreased by an order of magnitude after passivation.
- Carrier tunneling between QD layers was substantially reduced due to surface state modification.
- A rate equation model successfully explained the observed optical performance.
Conclusions:
- The optical performance of InAs QD hybrid structures is highly sensitive to surface passivation.
- Surface state modification by chemical treatment critically affects carrier dynamics.
- These findings highlight the potential of InAs QD hybrid structures for sensitive environmental sensing applications.
