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Credit:Dan Dry

A vial of nanocrystals in solution, which serve as "electronic glue" for semiconductor-based technologies.

Abstract:
Researchers at the University of Chicago have developed an "electronic glue" that could accelerate advances in semiconductor-based technologies, including solar cells and thermoelectric devices that convert sun light and waste heat, respectively, into useful electrical energy.

New ‘Electronic Glue’ Promises Cheaper Semiconductors

Chicago, IL | Posted on June 11th, 2009

Semiconductors have served as choice materials for many electronic and optical devices because of their physical properties. Commercial solar cells, computer chips and other semiconductor technologies typically use large semiconductor crystals. But that is expensive and can make large-scale applications such as rooftop solar-energy collectors prohibitive.

For those uses, engineers see great potential in semiconductor nanocrystals, sometimes just a few hundred atoms each. Nanocrystals can be readily mass-produced and used for device manufacturing via inkjet printing and other solution-based processes. But a problem remains: The crystals are unable to efficiently transfer their electric charges to one another due to surface ligand--bulky, insulating organic molecules that cap nanocrystals.

The "electronic glue" developed in Dmitri Talapin's laboratory at the University of Chicago solves the ligand problem. The team describes in the journal Science how substituting the insulating organic molecules with novel inorganic molecules dramatically increases the electronic coupling between nanocrystals. The University of Chicago licensed the underlying technology for thermoelectric applications to Evident Technologies in February.

Citation: "Colloidal Nanocrystals with Molecular Metal Chalcogenide Surface Ligands," Maksym V. Kovalendo, Department of Chemistry, University of Chicago; Marcus Scheele, Molecular Foundry, Lawrence Berkeley National Laboratory; and Dmitri V. Talapin, Department of Chemistry, University of Chicago, and Center for Nanoscale Materials, Argonne National Laboratory, Science, June 12, 2009.

Funding sources: American Chemical Society Petroleum Research Fund, the Chicago Energy Initiative, U.S. Department of Energy and Evident Technologies Inc.

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Contacts:
Steve Koppes
773-702-8366

Scientific Contact:
Dmitri Talapin
773-834-2606

Sources not involved in the research who can comment:

Geoffrey Ozin
Professor of Material Chemistry
University of Toronto
416-978-2082

Nicholas Kotov
Professor of Chemical Engineering
University of Michigan
734-763-8768