Probing the core-shell-shell structure of CdSe/CdTe/CdS type II quantum dots for solar cell applications

Electron Microscopy and Analysis Group Conference 2013

Lewis, E.A.^1 ; Page, R.C.^2 ; Binks, D.J.^3 ; Pennycook, T.J.^4,5 ; O'Brien, P.^1,2 ; Haigh, S.J.^1

School of Materials, University of Manchester, M13 9PL Manchester, United Kingdom^1

School of Chemistry, University of Manchester, M13 9PL Manchester, United Kingdom^2

Photon Science Institute, School of Physics and Astronomy, University of Manchester, M13 9PL Manchester, United Kingdom^3

Department of Materials, Oxford University, Parks Road, OX1 3PH Oxford, United Kingdom^4

SuperSTEM, STFC Daresbury Laboratories, WA4 4AD Warrington, United Kingdom^5

关键词: Colloidal quantum dots;    High-angle annular dark fields;    Multiple exciton generations;    Physical structures;    Scanning transmission electron microscopes;    Shell structure;    Solar-cell applications;    Type II quantum dots;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/522/1/012069/pdf
DOI  :  10.1088/1742-6596/522/1/012069

来源: IOP

【 摘 要 】

A greater understanding of multiple exciton generation in heterostructured colloidal quantum dots can be achieved through detailed modelling, and used to optimise their design for solar cell applications. However, such modelling requires an accurate knowledge of the physical structure of the quantum dots. Here we report the use of high angle annular dark field (HAADF) scanning transmission electron microscope (STEM) imaging to study the size and shape of CdSe/CdTe/CdS type II quantum dots at each of the three stages of their synthesis.