Lead-chalcogenide quantum dot (QD) assemblies represent a promising semiconductor technology for next-generation low-cost photovoltaics. However, all QD electronic devices made to date employ highly disordered QD films because it has been proven difficult to produce superlattice films that are also electrically conductive. Here, we report using an organic molecular wire to mediate the assembly of PbSe QD into superlattice thin films that result in significantly enhanced electrical transport. Specifically, we fabricated conductive PbSe QD superlattice films by exchanging oleate ligands with long conjugated molecular wire ligands that avoid disorder caused by volume changes and enable dynamic self-assembly from solution or via post-assembly solvent annealing of wire-capped films. An over 100-fold increase in carrier mobilities was observed in ordered QD nanocomposites as compared to glassy QD nanocomposites, making these molecular wire/QD hybrid materials promising candidates for QD photovoltaics.<br/>

Hybrid organic-inorganic quantum dot superlattices for photovoltaics

253rd National Meeting (2017)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.