Events Calendar

EVENTS IN April 2014

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Thursday, April 3, 2014

3:00 PM - 4:00 PM

ANSER Center Seminar - Jonathan Owen of Columbia University

Dr. Jonathan Owen of Columbia University will visit Northwestern to deliver an ANSER seminar titled, "The Coordination Chemistry of Semiconductor Nanocrystals."

 

Abstract:

Surfaces dominate the properties of colloidal semiconductor nanocrystals. Characterizing and controlling surface coordination chemistry is therefore crucial to their application in optoelectronics and fluorescence labeling. I will describe our picture of nanocrystal surface structure as well as a novel ligand exchange technique that allows us to fabricate all‐inorganic semiconductor films using solution techniques. In particular, we have exchanged carboxylate ligands for chloride ligands in the presence of alkylphosphines and prepared thin film transistors with unusually high electron mobilities (20 cm^2/V/sec). Using 31P NMR spectroscopy we monitor the binding and exchange of tri‐nalkylphosphines and can estimate the relative binding affinities of amines, phosphines and phosphine oxides. I will also briefly discuss our work on the structural characterization of large semiconductor molecules or molecular clusters.

 

Please contact Ria Hirsch, r-hirsch@northwestern.edu with all questions.

Contact Info: Ria Hirsch

Location: Ryan Hall 2190 Campus Drive Ryan 4003 Evanston, IL 60208

ANSER Center Seminar - Jonathan Owen of Columbia University

Dr. Jonathan Owen of Columbia University will visit Northwestern to deliver an ANSER seminar titled, "The Coordination Chemistry of Semiconductor Nanocrystals."

 

Abstract:

Surfaces dominate the properties of colloidal semiconductor nanocrystals. Characterizing and controlling surface coordination chemistry is therefore crucial to their application in optoelectronics and fluorescence labeling. I will describe our picture of nanocrystal surface structure as well as a novel ligand exchange technique that allows us to fabricate all‐inorganic semiconductor films using solution techniques. In particular, we have exchanged carboxylate ligands for chloride ligands in the presence of alkylphosphines and prepared thin film transistors with unusually high electron mobilities (20 cm^2/V/sec). Using 31P NMR spectroscopy we monitor the binding and exchange of tri‐nalkylphosphines and can estimate the relative binding affinities of amines, phosphines and phosphine oxides. I will also briefly discuss our work on the structural characterization of large semiconductor molecules or molecular clusters.

 

Please contact Ria Hirsch, r-hirsch@northwestern.edu with all questions.

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Argonne-Northwestern Solar Energy Research (ANSER) Center.
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