Journal
NANO LETTERS
Volume 10, Issue 5, Pages 1805-1811Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl100498e
Keywords
Nanocrystals; exciton dissociation; internanocrystal coupling; electric force microscopy
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Funding
- Cornell Center for Materials Research
- KAUST-CU Center for Energy and Sustainability
- NSF
- Agency of Science, Technology and Research (A*STAR), Singapore
- NYSTAR
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Internanocrystal coupling induced excitons dissociation in lead salt nanocrystal assemblies is investigated. By combining transient photoluminescence spectroscopy, grazing incidence small-angle X-ray scattering, and time-resolved electric force microscopy, we show that excitons can dissociate, without the aid of an external bias or chemical potential gradient, via tunneling through a potential barrier when the coupling energy is comparable to the exciton binding energy. Our results have important implications for the design of nanocrystal-based optoelectronic devices.
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