Journal
NANO LETTERS
Volume 11, Issue 9, Pages 3701-3706Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl201682h
Keywords
Depleted heterojunction; colloidal quantum dot; bandgap engineering; photovoltaics; solar cell; quantum funnel
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Funding
- King Abdullah University of Science and Technology (KAUST) [KUS-11-009-21]
- NSERC
- Queen Elizabeth II/Ricoh Canada
- MITACS
- NSERC CGS M
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Colloidal quantum dots offer broad tuning of semiconductor bandstructure via the quantum size effect. Devices involving a sequence of layers comprised of quantum dots selected to have different diameters, and therefore bandgaps, offer the possibility of funneling energy toward an acceptor. Here we report a quantum funnel that efficiently conveys photoelectrons from their point of generation toward an intended electron acceptor. Using this concept we build a solar cell that benefits from enhanced fill factor as a result of this quantum funnel. This concept addresses limitations on transport in soft condensed matter systems and leverages their advantages in large-area optoelectronic devices and systems.
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