Saturday February 10 Pick Up from Montford Inn, Matt Johnson. While much progress has been made especially in control of size dispersion, shape and photoluminescence efficiency, the influence of charges on many properties of semiconductor nanocrystals is beginning to receive increasing attention. Understanding charging effects, inherent and induced charge separation, and charge transfer processes are all important in any future electronic and opto-electronic applications. Large permanent dipole moments have been observed in semiconductor nanocrystals. Chemical modifications can enhance charge separation with electrons delocalized in the quantum confined conduction band states over a millisecond while the holes are localized in trap states.
Charge transfer can now extend the lifetimes of the conduction electrons to the static limit.
Charge transfer doping has led to the new n-type colloidal nanocrystals.