Core/Shell Magic-Sized CdSe Nanocrystals,Nano Letters

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Core/Shell Magic-Sized CdSe Nanocrystals
Nano Letters ( IF 9.6 ) Pub Date : 2021-08-31 , DOI: 10.1021/acs.nanolett.1c02412
Andrew B Pun ₁ , Aniket S Mule ₁ , Jacob T Held ₁ , David J Norris ₁

Affiliation

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, Cd_xZn_1–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.

中文翻译：

核/壳魔法大小的 CdSe 纳米晶体

神奇尺寸的半导体纳米晶体 (MSNC) 通过特定尺寸之间的离散跳跃生长。尽管它们具有提供原子级精确结构的潜力，但它们的使用受到稳定性差和陷阱主导的光致发光的限制。最近，CdSe MSNC 已发展到更大的尺寸。我们利用这种粒子并展示了一种通过高温合成在 CdSe MSNC 核上生长壳的方法。薄的 CdS 壳显着改善了 MSNC 的发射特性，缩小了它们的荧光线宽，提高了光致发光量子产率，并消除了陷阱发射。虽然较厚的 CdS 壳会导致性能下降，但 Cd _x Zn _{1– x}S合金外壳保持高效和狭窄的发射线。这些合金核/壳微晶呈现四面体形状，与最近的 MSNC 生长模型一致。我们的结果表明 MSNCs 可以与其他最先进的半导体纳米晶体竞争。此外，这些核/壳结构将允许进一步研究 MSNC 及其原子精确生长的潜力。

更新日期：2021-09-22

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