Zachariah Norman (Owen Group)
1:00pm - 2:00pm
Printable electronics offer the possibility of large area, low cost fabrication with applications including shipping quality assurance, theft-deterrence, and low-cost displays. Semiconductor nanocrystal solutions provide a source of soluble semiconductor material for printable electronics, however their use is often stymied by complex and irreproducible chemistry.
This talk will discuss how to chemically define the nanocrystal surface, the major reactions which can occur at the surface, and some examples how using the reactivity to tune the morphological and transport properties of thin films. Using Green’s covalent bond classification scheme, I will rationalize the effects of ligand exchange on nanocrystal photo-physics. I will then present a scheme for replacing non-volatile ligands with halides, volatile alkyl-phosphines, and alkyl-amines.
Through analysis of X-ray diffraction data, this talk will demonstrate a link between nanocrystal fusion and trans-conductance of thin films. This will include a brief introduction of X-ray pair distribution analysis of powder diffraction data, which is a powerful X-ray based technique for studying the nano-scale structure of materials. Chemical control over the morphology of thin films will also be demonstrated by tuning the concentration of cadmium chloride through ligand exchange.