Journal
NANO LETTERS
Volume 12, Issue 8, Pages 4235-4241Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl301847r
Keywords
PbS; multiexciton generation; multiple exciton dissociation; charged QDs
Categories
Funding
- National Science Foundation [CHE-0848556]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0848556] Funding Source: National Science Foundation
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Multiple exciton generation (MEG) in quantum dots (QDs), a process by which one absorbed photon generates multiple electron-hole pairs, has provided exciting possibilities for improving the energy conversion efficiency of photovoltaic and photocatalytic devices. However, implementing MEG in practical devices requires the extraction of multiple charge carriers before exciton-exciton annihilation and the development of materials with improved MEG efficiency. In this report, using PbS QD/methylene blue complexes as a QD/electron acceptor model system, we demonstrate that the presence of electron acceptors does not affect the MEG efficiency of QDs and all generated excitons can be dissociated by electron transfer to the acceptor, achieving MEG and multiple exciton dissociation efficiencies of 112%. We further demonstrate that these efficiencies are not affected by the charging of QDs.
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