Near-Infrared Cu−In−Se-Based Colloidal Nanocrystals via Cation Exchange
Creators
- 1. TU Dresden
- 2. Istituto Italiano di Tecnologia
- 3. Chemnitz University of Technology
Description
A three-step colloidal synthesis of near-infrared active Cu−In−Se (CISe)-based nanocrystals (NCs) via a sequential partial cation exchange has been realized in one pot. In the first step, binary highly copper deficient Cu2−xSe NCs were synthesized, followed by a partial cation exchange of copper to indium ions, yielding CISe NCs. This reaction allows for a precise control of the composition of the resulting NCs through a simple variation of the ratio between guest-cation precursors and parent NCs. To enhance the stability and the photoluminescence (PL) properties of the NCs, a subsequent ZnS shell was grown in the third step, resulting in CISeS/ZnS core/shell particles. At high reaction temperature of the shell growth, it is possible to obtain In-rich CISeS/ZnS NCs whose emission was shifted to the visible region.
Files
Chem Mater 2018 30 2607.pdf
Files
(4.7 MB)
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