Polytypic Zn-(In,Ga)-Se Nanocrystals with Tunable Emission.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40974614.
- Also identified by DOI 10.1021/acs.nanolett.5c03311.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
While the polymorphism of chalcopyrite semiconductors has been widely studied, the wurtzite analogues of defect-chalcopyrite II-III<sub>2</sub>-VI<sub>4</sub> compositions, such as Zn(In,Ga)<sub>2</sub>(S,Se)<sub>4</sub>, remain underexplored. Here, we report the synthesis of polytypic Zn-(In,Ga)-Se multipods via cation exchange using ZnSe as a template. With zinc-blende cores and wurtzite arms elongated along the hexagonal <i>c</i>-axis, the multipods retain the structure and morphology of the ZnSe template. Optical characterization reveals composition-dependent absorption and photoluminescence, tunable from the visible to the near-infrared region, with spectral features distinct from those of previously reported defect-chalcopyrite structures. Temperature-dependent measurements demonstrate strong emission at cryogenic temperatures, which is quenched near room temperature due to thermally activated nonradiative processes. We illustrate the use of ZnSe as a platform for cation exchange toward wurtzite multinary chalcogenides, unlocking access to novel structures with colorful optical properties.