Coherency Strain Effects on the Optical Response of Core/Shell Heteronanostructures

Abstract

Core/shell-structured CdSe/CdS nanoparticles were prepared by a one-pot procedure. The interface effect was studied by steady-state and time-resolved photoluminescence spectroscopy. Coherency strain across the CdSe/CdS interface is addressed to rationalize the measured optical response. The optical properties of the different core/shell systems agree with Matthews−Blakeslee theory, which predicts a critical thickness for a defect-free shell of less than two monolayers of capping material for the CdSe/CdS system.