Probing Size-Driven Exciton Behavior in InP Tetrapods via Time-Resolved Spectroscopy,ACS Photonics

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Probing Size-Driven Exciton Behavior in InP Tetrapods via Time-Resolved Spectroscopy
ACS Photonics ( IF 6.5 ) Pub Date : 2024-08-31 , DOI: 10.1021/acsphotonics.4c00948
Bora Kim _{1,

2} , Sunghu Kim ₁ , Eunhye Cho ₁ , Sohee Jeong _{1,

3} , Young-Shin Park ₄

Affiliation

Quantum-confined nanocrystals (NCs) have garnered huge attention in various applications due to their unique optoelectronic properties arising from quantum confinement effects. Recently, single-crystalline InP tetrapods have been proposed as an attractive system, allowing modulation from single-photon to multiphoton emission by tuning the size of the tetrapods. Herein, the size-driven exciton behavior in tetrapods is investigated through time-resolved spectroscopy to achieve a fundamental understanding of their unique emission transition. The experimental results reveal that the behavior of excitons and biexcitons exhibits distinct trends with varying sizes, showing a remarkable 4-fold enhancement in the biexciton Auger lifetime as the size increases. Our findings clarify that the transition between single-photon and multiphoton emission arises from a volume effect and the interplay between quantum confinement and Coulomb interactions. This research provides fundamental knowledge of the optical properties of single-crystalline tetrapods and highlights the potential for functional selection in NCs based on size and shape control.

中文翻译：

通过时间分辨光谱探测 InP 四足体中尺寸驱动的激子行为

量子限制纳米晶体（NC）由于量子限制效应而具有独特的光电特性，在各种应用中引起了广泛关注。最近，单晶 InP 四足体被认为是一种有吸引力的系统，可以通过调节四足体的尺寸来实现从单光子发射到多光子发射的调制。在此，通过时间分辨光谱研究了四足体中尺寸驱动的激子行为，以实现对其独特发射跃迁的基本了解。实验结果表明，激子和双激子的行为随着尺寸的变化表现出明显的趋势，随着尺寸的增加，双激子俄歇寿命显着增加了4倍。我们的研究结果阐明，单光子和多光子发射之间的转变是由体积效应以及量子限制和库仑相互作用之间的相互作用引起的。这项研究提供了单晶四足体光学性质的基础知识，并强调了基于尺寸和形状控制的NC功能选择的潜力。

更新日期：2024-08-31

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