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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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Article information


Submitted
10 Feb 2014
Accepted
14 Apr 2014
First published
15 May 2014

Chem. Sci., 2014,5, 2696-2701
Article type
Edge Article

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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