Exciton–Phonon Coupling in Single ZnCdSe-Dot/CdS-Rod Nanocrystals with Engineered Band Gaps from Type-II to Type-I,ACS Photonics

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Exciton–Phonon Coupling in Single ZnCdSe-Dot/CdS-Rod Nanocrystals with Engineered Band Gaps from Type-II to Type-I
ACS Photonics ( IF 6.5 ) Pub Date : 2024-09-06 , DOI: 10.1021/acsphotonics.4c00931
Florian Johst ₁ , Jannik Rebmann ₁ , Hans Werners ₁ , Lars Klemeyer ₂ , Jagadesh Kopula Kesavan ₂ , Dorota Koziej ₂ , Christian Strelow ₁ , Gabriel Bester _{1,

3} , Alf Mews ₁ , Tobias Kipp ₁

Affiliation

Exciton–phonon coupling limits the homogeneous emission line width of nanocrystals. Hence, a full understanding of this is crucial. In this work, we statistically investigate exciton–phonon coupling by performing single-particle spectroscopy on colloidal Zn_1–xCd_xSe/CdS and CdSe/CdS dot-in-rod nanocrystals at cryogenic temperatures (T ≈ 10 K). In situ cation exchange enables us to analyze different band alignments and, thereby, different charge-carrier distributions. We find that the relative intensities of the longitudinal optical S- and Se-type phonon replicas correlate with the charge-carrier distribution. Our experimental findings are complemented with quantum mechanical calculations within the effective mass approximation that hint at the relevance of surface charges.

中文翻译：

具有从 II 型到 I 型设计带隙的单 ZnCdSe-Dot/CdS-Rod 纳米晶体中的激子-声子耦合

激子-声子耦合限制了纳米晶体的均匀发射线宽度。因此，充分理解这一点至关重要。在这项工作中，我们通过在低温（ T ≈ 10 K）下对胶体 Zn _{1– x} Cd _x Se/CdS 和 CdSe/CdS 点棒纳米晶体进行单粒子光谱研究，统计研究激子-声子耦合。原位阳离子交换使我们能够分析不同的能带排列，从而分析不同的载流子分布。我们发现纵向光学 S 型和 Se 型声子复制品的相对强度与载流子分布相关。我们的实验结果与有效质量近似内的量子力学计算相补充，暗示了表面电荷的相关性。

更新日期：2024-09-06

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