Accueil du site > Vie du laboratoire > Congrès / Colloques / Conférences > Optical Properties of Individual Nanowires and Quantum Dots in High Magnetic Field, Septembre 2014 > Programme du workshop > Abstract : Chemical synthesis of greener semiconductor quantum dots and Si nanowires


Abstract : Chemical synthesis of greener semiconductor quantum dots and Si nanowires

« Chemical synthesis of greener semiconductor quantum dots and Si nanowires »

P. Reiss

Abstract :
Colloidal semiconductor nanocrystals (quantum dots) have been investigated for more than 30 years now, since the discovery of the quantum confinement effect in the early 1980s. Motivated by the possibility of adjusting the optical and electronic properties of quantum dots with size, the field progressed through the close synergy between chemistry and physics. In particular, several important progresses have been enabled through the development of chemical synthesis methods giving access to precisely controlled size, shape and composition of colloidal quantum dots. As an example, core/shell systems with one or several semiconductor materials grown on the surface of a core quantum dot enable a strong improvement of the fluorescence properties in terms of quantum yield and photostability. On the other hand, most of these developments have focused so far on CdSe based quantum dots for the visible range and PbS or PbSe based quantum dots for the near infrared range. In our team we are developing since 2007 alternative materials, in particular of InP and CuInS2 based quantum dots. I will present recent advances in the synthesis, functionalization and applications of Cd- and Pb-free quantum dots.
When going from 0D quantum dots to 1D nanowires the confinement in one dimension is relieved. Nanowires of divers materials also show unique optical, electrical and magnetic properties. In comparison with quantum dots their geometry can be advantageously exploited for electrical conduction in the unconfined direction. Silicon nanowires are generally synthesized by vapor-liquid-solid methods using chemical vapor deposition techniques or by controlled etching of silicon wafers. We recently developed a synthesis method giving access to larger quantities of Si nanowires and enabling their doping.