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Effect of Metal Ions on Photoluminescence, Charge Transport, Magnetic and Catalytic Properties of All-Inorganic Colloidal Nanocrystals and Nanocrystal Solids

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    Effect of Metal Ions on Photoluminescence, Charge Transport, Magnetic and Catalytic Properties of All-Inorganic Colloidal Nanocrystals and Nanocrystal Solids
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    † Department of Chemistry and James Frank Institute, University of Chicago, Illinois 60637, United States
    ‡ ‡Center for Nanoscale Materials, §Chemical Sciences and Engineering, and ⊥Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
    [email protected]
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    Cite this: J. Am. Chem. Soc. 2012, 134, 33, 13604–13615
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    https://doi.org/10.1021/ja301285x
    Published July 20, 2012
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    Abstract

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    Colloidal semiconductor nanocrystals (NCs) provide convenient “building blocks” for solution-processed solar cells, light-emitting devices, photocatalytic systems, etc. The use of inorganic ligands for colloidal NCs dramatically improved inter-NC charge transport, enabling fast progress in NC-based devices. Typical inorganic ligands (e.g., Sn2S64–, S2–) are represented by negatively charged ions that bind covalently to electrophilic metal surface sites. The binding of inorganic charged species to the NC surface provides electrostatic stabilization of NC colloids in polar solvents without introducing insulating barriers between NCs. In this work we show that cationic species needed for electrostatic balance of NC surface charges can also be employed for engineering almost every property of all-inorganic NCs and NC solids, including photoluminescence efficiency, electron mobility, doping, magnetic susceptibility, and electrocatalytic performance. We used a suite of experimental techniques to elucidate the impact of various metal ions on the characteristics of all-inorganic NCs and developed strategies for engineering and optimizing NC-based materials.

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    Cite this: J. Am. Chem. Soc. 2012, 134, 33, 13604–13615
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