Upcoming Colloquia

The Chemistry of Colloidal Nanocrystal Quantum Dots

Jeffrey Pietryga

Softmatter Nanotechnology and Advanced Spectroscopy,
Chemistry Division
Los Alamos National Laboratory,
Los Alamos, New Mexico 87545, USA

Monday, February 22, 10am

Chemistry Division Auditorium, TA-46, Bld. 535, Rm. 103


Colloidal nanocrystal quantum dots (NQDs) are a unique class of materials that are under widespread investigation for applications ranging from bio-labeling to solid-state lighting and photovoltaics. Their versatility stems from an elegant marriage of physics and chemistry in which the principles of chemical synthesis, centuries in development, are brought to bear directly on the problem of creating nanoscale structures with single atom-layer precision for the purposes of controlling the sub-nanosecond dynamics of electrons and holes. This talk will examine the unique hybrid inorganic/organic structure of NQDs and the basics of the colloidal growth process. We will then discuss the major developments in the field, with particular attention to their relevance to the problem of creating NQD-based solar cells. Topics will include: the syntheses of NQDs of II-VI, IV-VI, III-V and other classes of semiconductor materials; heterostructuring; shape control; ligand exchange and assembly into thin films.