Nanocrystal Arrays for Optoelectronic Applications Sol M. Gruner, Cornell University, DMR 0936384

1. Nanocrystal Arrays for Optoelectronic ApplicationsSol M. Gruner, Cornell University, DMR 0936384 Intellectual Merit: There has been much recent excitement about the use of nanometer-sized crystals (NC) for a wide variety of applications ranging from optoelectronics to catalysis. These nanocrystal superlattice arrays have interesting new optoelectronic properties that do not exist with individual NC particles. Scientists at Cornell University have developed a novel way to control creating nanocrystal superlattices by binding ligand molecules to specific sites on the NC surface. They found that ligands control long-range translational and orientational order, as confirmed by x-ray measurements at CHESS. In-situ grazing-incidence wide-angle x-ray scattering reveals random orientation of PbS nanocrystals (not shown) in FCC superlattices and orientational order of nanocrystal facets in BCC superlattices.. (Below) Graduate student Joshua Choi (center) wins a poster prize at the 2010 MRS meeting in Boston. Joshua J. Choi, Clive R. Bealing, Kaifu Bian, Kevin J. Hughes, Wenyu Zhang, Detlef-M. Smilgies, Richard G. Hennig, James R. Engstrom, and Tobias Hanrath, “Controlling Nanocrystal Superlattice Symmetry and Shape-Anisotropic Interactions through Variable Ligand Surface Coverage”, J. Am. Chem. Soc. 133, 3131-3138 (2011) CHESS DMR-0936384 2011_1