Journal
NANOPHOTONICS
Volume 7, Issue 1, Pages 111-126Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2017-0034
Keywords
multiple exciton generation; quantum dots; solar cells
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Funding
- EPSRC Centre for Doctoral Training in New and Sustainable Photovoltaics (CDT-PV)
- EPSRC
- Winton Program for the Physics of Sustainability
- Sackler and Cambridge Foundation
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Multiple exciton generation (MEG) in quantumconfined semiconductors is the process by which multiple bound charge-carrier pairs are generated after absorption of a single high-energy photon. Such charge-carrier multiplication effects have been highlighted as particularly beneficial for solar cells where they have the potential to increase the photocurrent significantly. Indeed, recent research efforts have proved that more than one chargecarrier pair per incident solar photon can be extracted in photovoltaic devices incorporating quantum-confined semiconductors. While these proof-of-concept applications underline the potential of MEG in solar cells, the impact of the carrier multiplication effect on the device performance remains rather low. This review covers recent advancements in the understanding and application of MEG as a photocurrent-enhancing mechanism in quantum dot-based photovoltaics.
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