AI 中文总结
本文研究InP纳米线中InAsxP1-x量子点的发射动力学，结合实验与理论分析，明确了量子点尺寸、组成及纳米线几何结构对发射的影响，揭示了珀塞尔效应的作用。
AI 中文摘要
本文对化学束外延法采用气-液-固机制生长、金纳米颗粒作为成核催化剂的InP纳米线（NWs）中嵌入的闪锌矿型InAsxP1-x量子点（QDs）的发射动力学开展了实验与理论研究。通过测量一组QD-NWs的时间分辨光致发光，确定了激子寿命对QD组成和高度的依赖关系。QD周围InP壳层厚度的变化提供了光子环境对载流子动力学影响的额外信息，高分辨率透射电子显微镜结合能量色散X射线光谱获得了实际结构参数。实验测得的寿命通过8带kp计算结合考虑库仑相互作用的组态相互作用模型、以及包含光限制效应的有限差分时域光子模拟的结果进行解释。要完全理解实验结果，需同时考虑QD势的变化和珀塞尔效应，后者在具有薄InP壳层的纳米线中会导致自发发射受到抑制。
英文摘要
Hereby, we present an experimental and theoretical investigation of emission dynamics in zincblende InAsxP1-x quantum dots (QDs) embedded in InP nanowires (NWs) grown via vapour-liquid-solid mechanism by chemical beam epitaxy, using Au nanoparticles as a nucleation catalyst. By measuring time-resolved photoluminescence from an ensemble of QD-NWs it was possible to determine the exciton lifetime dependence on QD composition and height. Changes in the InP shell thickness surrounding the InP NW stem with a QD, brought additional insight into the influence of photonic environment on the carrier dynamics. High-resolution transmission electron microscopy, combined with energy-dispersive X-ray spectroscopy, provided actual structural parameters. The experimentally obtained lifetimes were interpreted in the light of results of 8 band kp calculations combined with configuration-interaction model to take into account the Coulomb interactions and finite-difference time domain photonic simulations to include the effect of optical confinement. The full understanding of the experimental results required considering both, the changes in the QD potential and the Purcell effect, the latter leading to spontaneous emission inhibition in the case of NWs with thin InP shell.
Comments22 pages, 7 figures, submitted to: Photonics and Nanostructures - Fundamentals and Applications
