Temperature dependence of the exciton transition in semiconductor quantum dots

摘要

The authors measure the temperature dependence of the first absorption feature (dE/dT) for different sizes of CdSe/ZnS nanocrystals. In contrast to previous experiments, they find that dE/dT is experimentally identical for all nanocrystal sizes considered and agrees well with the bulk CdSe value. They show that a first order model that only considers the exciton confinement energy can explain the existing experimental dE/dT values for both epitaxial quantum dots (InAs, In_(0.6)Ga_(0.4)As, GaAs) and colloidal nanocrystals (CdSe, PbS, PbSe).