Hot injection synthesis and structural and optical characterization of CdSe/ZnSe and CdSe/ZnS quantum dots

In this thesis, first of all CdSe QDs were synthesis with hot injection chemically methods, after that it coated with ZnSe, ZnS, to create type-I core/shell respectively. Then they characterized by PL, UV-Vis, XRD, and strain amount in interfacial layer was obtained and capped core diameter after tensile shell deposition and the compressive theoretically calculated. The CdSe core and relative core/shell heterostructures synthesized in nanosemlab with our equipments according to the latest techniques referenced in articles. First, the optical properties were analyzed with UV-Vis, PL, then molecular and atomic structur of the synthesized QDs were analyzed by XRD. Molarity of core QDs were challenged us due to the difficulty of counting the number of QDs in our solution. To overcome this issue the molarity of QDs were calculated theoritically from litratures and different shell molarity were tested. The interface strain from lattice mismatch between core and shell was analyzed from applied in effective mass approximation and continuum elastic theory method to obtain the corresponding capped core diameter.