Confined-but-Connected Quantum Solids via Controlled Ligand Displacement

William J. Baumgardner, Kevin Whitham, Tobias Hanrath

Research output: Contribution to journalArticlepeer-review

155 Scopus citations


Confined-but-connected quantum dot solids (QDS) combine the advantages of tunable, quantum-confined energy levels with efficient charge transport through enhanced electronic interdot coupling. We report the fabrication of QDS by treating self-assembled films of colloidal PbSe quantum dots with polar nonsolvents. Treatment with dimethylformamide balances the rates of self-assembly and ligand displacement to yield confined-but-connected QDS structures with cubic ordering and quasi-epitaxial interdot connections through facets of neighboring dots. The QDS structure was analyzed by a combination of transmission electron microscopy and wide-angle and small-angle X-ray scattering. Excitonic absorption signatures in optical spectroscopy confirm that quantum confinement is preserved. Transport measurements show significantly enhanced conductivity in treated films. © 2013 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)3225-3231
Number of pages7
JournalNano Letters
Issue number7
StatePublished - Jun 27 2013
Externally publishedYes


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