Quantum Confinement in Cadmium Selenide Multilayer Thin Films Using Physical Vapour Deposition Method

摘要

Nanocrystals of CdSe have been produced in SiOx matrix layer and in ZnSe heterostructure layer byudthermal evaporation method. Structural studies were done by X-ray diffractometer. Quantum confinementudeffect of CdSe nanocrystals was analyzed from optical studies. Bulk CdSe has band-gap energy of 1.756 eVudthat can be shifted to larger values by reducing the crystal size to dimensions smaller than the Bohr radiusudof the exciton. Experimentally measured band-gap shifts with respect to the bulk value for quantum dotudthin films are compared with the predictions of the effective mass approximation model (i.e., Brus model)udand Quantum mechanical model. Sizes of the crystallites calculated from both models were coincident withudeach other.When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/27793