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Issue 7, 2014
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Impact of surface ligands on the photocurrent enhancement due to multiple exciton generation in close-packed nanocrystal thin films

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Abstract

Semiconducting nanocrystal quantum dot (QD) films with high multiple exciton generation (MEG) efficiencies and high exciton dissociation efficiencies are appealing as solar cell materials. Here, we report the strong enhancement of the photocurrent in close-packed QD films, and discuss the importance of surface ligands on MEG and charge transport in QD films. Both exciton-recombination and charge-transport properties are influenced by the phenomenon of carrier tunnelling between neighboring QDs in thin films. These results can have important implications in the design of chemical treatments to control the electronic interactions between QDs in solution-processed solar cells. We demonstrate that the inorganic- and small sized-ligand passivation of PbS QDs by potassium thiocyanate causes a significant photocurrent enhancement.

Graphical abstract: Impact of surface ligands on the photocurrent enhancement due to multiple exciton generation in close-packed nanocrystal thin films

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Publication details

The article was received on 10 Feb 2014, accepted on 14 Apr 2014 and first published on 15 May 2014


Article type: Edge Article
DOI: 10.1039/C4SC00436A
Citation: Chem. Sci., 2014,5, 2696-2701
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    Impact of surface ligands on the photocurrent enhancement due to multiple exciton generation in close-packed nanocrystal thin films

    M. Ono, T. Nishihara, T. Ihara, M. Kikuchi, A. Tanaka, M. Suzuki and Y. Kanemitsu, Chem. Sci., 2014, 5, 2696
    DOI: 10.1039/C4SC00436A

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