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- Title
Structural characterization of CdSe/ZnS core-shell quantum dots (QDs) using TEM/STEM observation.
- Authors
Shin, Huiyoun; Jang, Dongseon; Hwang, Jaesung; Jang, Youngil; Cho, Myungju; Park, Kyuho
- Abstract
CdSe/ZnS core-shell structured nano-crystal quantum dots (QDs) are ideal candidates for light-emission applications due to their high quantum efficiency, narrow-band, and particle-size-tunable photoluminescence. In particular, their small size results in the quantum confinement of semiconductor nano-crystals, which widens their energy gaps. In general, structural analyses of QDs using a transmission electron microscope (TEM) are very important due to the significantly small size of QDs. We were able to obtain structural information of CdSe/ZnS core-shell QDs using nano-beam diffraction by controlling the nano-probe of the dark field scanning TEM (DF-STEM) mode and strain analysis with high-resolution TEM (HRTEM)/STEM images. Furthermore, we could clearly distinguish the interface between the CdSe core and the ZnS shell from the strain analysis with the HRTEM/STEM images.
- Subjects
QUANTUM dots; NANOCRYSTALS; QUANTUM efficiency; PHOTOLUMINESCENCE; QUANTUM confinement effects; STRUCTURAL analysis (Engineering); TRANSMISSION electron microscopes
- Publication
Journal of Materials Science: Materials in Electronics, 2014, Vol 25, Issue 5, p2047
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-014-1838-x