Formation of Intrinsic Defects in the Growth of CdS Nanocrystals

Abstract

Cadmium sulfide nanocrystals (NCs CdS) are synthesized by sol-gel method. It’s have sufficiently intense photoluminescence in the visible region of the spectrum and have a size of 3.2 – 4.1 nm. It is shown that in the early stages of growth of nanocrystals own lattice defects and the corresponding luminescence centers are not formed at the same time. Defects occur first - cadmium vacancies having luminescence band at long wavelengths with hνmax = 1.9 eV. Further, defects are begin to form by with the growth of NCs, and are represented – cadmium vacancy and oxygen in place of sulfur. Complex - cadmium vacancy and sulfur vacancy is formed after. Interstitial cadmium is appears last. With further growth of NCs, all luminescence bands of already formed defects are shifted to longer wavelengths synchronously with further decrease in the effective bandgap. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/37102