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Wave function engineering for efficient extraction of up to nineteen electrons from one CdSe/CdS quasi-type II
Haiming Zhu1, Nianhui Song, William Rodríguez-Córdoba
1Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA.
Journal of the American Chemical Society
|February 15, 2012
Summary
CdSe/CdS quantum dots efficiently harvest light and separate charges for solar fuel production. These quasi-type II structures enable ultrafast charge separation and slow recombination, boosting artificial photosynthesis.
Area of Science:
- Materials Science
- Photochemistry
- Nanotechnology
Background:
- Solar-to-fuel conversion demands efficient light harvesting and charge separation.
- Catalysts are crucial for accelerating reactions in these devices.
Purpose of the Study:
- To investigate the charge separation and recombination dynamics in CdSe/CdS quasi-type II quantum dots.
- To explore their potential as light harvesting and charge separation components in artificial photosynthesis.
Main Methods:
- Utilized CdSe/CdS quasi-type II quantum dots.
- Analyzed electron and hole wave function distribution.
- Measured charge separation, recombination, and Auger annihilation lifetimes.
Main Results:
- Achieved simultaneous ultrafast charge separation (0.18 ps) and ultraslow recombination (0.4 μs).
- Observed slow multiple-exciton Auger annihilation (440 ps biexciton lifetime).
- Generated up to nineteen excitons per quantum dot (QD) and dissociated them with unity yield via electron transfer to methylviologen.
Conclusions:
- Spatial wave function distribution in quasi-type II nanoheterostructures facilitates efficient multiple exciton dissociation.
- These engineered structures can deliver multiple electrons to acceptors, showing promise for artificial photosynthetic devices.
