title: Investigation into the heterostructure interface of CdSe-based core-shell quantum dots using surface-enhanced Raman spectroscopy.
abstract: The structural nature of heterointerfaces in core-shell semiconductor quantum dots (QDs) plays a crucial role in tailoring their optical properties. In this work we have focused on using surface-enhanced Raman spectroscopy as a nondestructive tool to investigate the structural evolution of such interfaces in CdSe/CdS and CdSe/Cd0.5Zn0.5S colloidal QDs. A comparison between the two systems shows significant structural variation across the core-shell interfaces for the two different materials: a smooth interface for the former and an abrupt interface for the latter. This structural difference modifies the electronic structure within the QDs, which directly dictates the confinement behavior of the electrons and holes. The implications of this translate to a better understanding of why graded CdSe/CdS/Cd0.5Zn0.5S/ZnS QDs are so lucrative for linear and nonlinear fluorescence-based applications.
authors.affiliation: Department of Chemical Science and UR INSTM, University of Padova, Via Marzolo 1, I-35131 Padova, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Todescato
authors.forename: Alessandro
authors.initials: A
authors.lastname: Minotto
authors.forename: Raffaella
authors.initials: R
authors.lastname: Signorini
authors.forename: Jacek J
authors.initials: JJ
authors.lastname: Jasieniak
authors.forename: Renato
authors.initials: R
authors.lastname: Bozio