期刊
NANO LETTERS
卷 21, 期 18, 页码 7651-7658出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02412
关键词
core/shell nanocrystals; CdSe/CdS/ZnS; magic-sized clusters; discrete growth; atomically precise
类别
资金
- Swiss National Science Foundation (SNSF) [200021-188593]
- ETH Zurich Postdoctoral Fellowship
- Swiss National Science Foundation (SNF) [200021_188593] Funding Source: Swiss National Science Foundation (SNF)
The research team successfully grew thin CdS shells on CdSe MSNC cores via high-temperature synthesis, dramatically improving the emissive properties of the MSNCs. Thicker CdS shells result in decreased performance, but CdxZn1-xS alloyed shells maintain efficient and narrow emission lines.
Magic-sized semiconductor nanocrystals (MSNCs) grow via discrete jumps between specific sizes. Despite their potential to offer atomically precise structures, their use has been limited by poor stability and trap-dominated photoluminescence. Recently, CdSe MSNCs have been grown to larger sizes. We exploit such particles and demonstrate a method to grow shells on CdSe MSNC cores via high-temperature synthesis. Thin CdS shells lead to dramatic improvements in the emissive properties of the MSNCs, narrowing their fluorescence line widths, enhancing photoluminescence quantum yields, and eliminating trap emission. Although thicker CdS shells lead to decreased performance, CdxZn1-xS alloyed shells maintain efficient and narrow emission lines. These alloyed core/shell crystallites exhibit a tetrahedral shape, in agreement with a recent model for MSNC growth. Our results indicate that MSNCs can compete with other state-of-the-art semiconductor nanocrystals. Furthermore, these core/shell structures will allow further study of MSNCs and their potential for atomically precise growth.
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