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Structural characterization of CdSe/ZnS core–shell quantum dots (QDs) using TEM/STEM observation

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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.

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Authors and Affiliations

  1. Materials Characterization Team, Materials and Components Laboratory, LG Electronics Advanced Research Institute, 38 Baumoe-ro, Seocho-gu, Seoul, 137-724, South Korea

    Huiyoun Shin, Jaesung Hwang, Youngil Jang, Myungju Cho & Kyuho Park

  2. New Device Team, LG Electronics Advanced Research Institute, 38 Baumoe-ro, Seocho-gu, Seoul, 137-724, South Korea

    Dongseon Jang

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  1. Huiyoun Shin
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  2. Dongseon Jang
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  3. Jaesung Hwang
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  4. Youngil Jang
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  5. Myungju Cho
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  6. Kyuho Park
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Correspondence to Huiyoun Shin.

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Shin, H., Jang, D., Hwang, J. et al. Structural characterization of CdSe/ZnS core–shell quantum dots (QDs) using TEM/STEM observation. J Mater Sci: Mater Electron 25, 2047–2052 (2014). https://doi.org/10.1007/s10854-014-1838-x

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  • DOI: https://doi.org/10.1007/s10854-014-1838-x

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