Journal
ACS NANO
Volume 6, Issue 4, Pages 3128-3133Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn204910g
Keywords
nanocrystals; solar cells; ligands; quantum-confined Stark effect; type II heterojunction
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Funding
- Ollendorff Minerva Center
- Russell Berrie Nanotechnology Institute at the Technion-Israel Institute of Technology
- GRF from Research Grants Council of Hong Kong [102810]
- Ministry of Absorption of the State of Israel
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We show that it is possible to combine several charge generation strategies in a single device structure, the performance of which benefits from all methods used. Exploiting the inherent type II heterojunction between layered structures of CdSe and CdTe colloidal quantum dots, we systematically study different ways of combining such nanocrystals of different size and surface chemistry and with different linking agents in a bilayer solar cell configuration. We demonstrate the beneficial use of two distinctly different sizes of NCs not only to improve the solar spectrum matching but also to reduce exciton binding energy, allowing their efficient dissociation at the interface. We further make use of the ligand-induced quantum-confined Stark effect in order to enhance charge generation and, hence, overall efficiency of nanocrystal-based solar cells.
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