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Cleavable Ligands Enable Uniform Close Packing in Colloidal Quantum Dot Solids

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journal contribution
posted on 07.10.2015, 00:00 by Graham H. Carey, Mingjian Yuan, Riccardo Comin, Oleksandr Voznyy, Edward H. Sargent
Uniform close packing in colloidal quantum dot solids is critical for high-optical density, high-mobility optoelectronic devices. A hybrid-ligand strategy is developed, combining the advantages of solid state and solution-phase ligand exchanges. This strategy uses a medium length thioamide ligand that is readily cleaved in a single chemical treatment, leading to quantum dot solids with uniformly packed domains 3 times larger than those observed in ligand-exchanged films.