金杂化CsPbBr3钙钛矿纳米薄片的激子动力学。

IF 4.6 2区 化学 Q2 CHEMISTRY, PHYSICAL
Eeshani Bora, Jugal P. Das, Subarna Samanta, Abhishek Kumar and Tushar Debnath*, 
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引用次数: 0

摘要

量子大小粒子的极性激发与金属纳米颗粒中的局部表面等离子激子的相互作用导致了一种称为激子的准粒子的形成,一种耦合激子-等离子激子极化子。我们报道了使用光学光谱测量在金杂化CsPbBr3纳米薄片(NPls)中观察到的厚度依赖的pl激子。我们的研究结果表明,更大的量子和介电约束导致薄CsPbBr3 NPls中的激子结合能非常大,增强了Fröhlich相互作用。实际上,激子-声子散射现象主导了薄npl中的激子衰减动力学。令人惊讶的是,在薄CsPbBr3 npl中,当Au掺入时,激子-声子散射完全消失,通过Au的局部表面等离子体激子与薄npl中受限激子之间的耦合,指导了强激子的形成。在这里,等离子体感应电场通过npl传播,从而改变了导致激子结合能升高的介电场强度,并对激子引入了额外的筛选效应。反过来,激子结合能显著降低,阻碍了激子-声子相互作用。此外,激子结合能的减弱延长了激子寿命,增加了自由载流子产率,并表现出明显的厚度依赖性,突出了它们在非线性光电子学中的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Plexciton Dynamics in Au-Hybrid CsPbBr3 Perovskite Nanoplatelets

Plexciton Dynamics in Au-Hybrid CsPbBr3 Perovskite Nanoplatelets

Interaction of polar excitations in quantum size particles and localized surface plasmons in metallic nanoparticles results in formation of a quasi-particle called plexciton, a coupled exciton–plasmon polariton. We report observation of thickness dependent plexcitons in Au-hybrid CsPbBr3 nanoplatelets (NPls) using optical spectroscopic measurements. Our results suggest that the greater quantum and dielectric confinement leads to extremely large exciton binding energies in thin CsPbBr3 NPls, enhancing the Fröhlich interaction. In effect, exciton–phonon scattering phenomenon dominates the exciton decay dynamics in thin NPls. Surprisingly, the exciton–phonon scattering vanishes completely on Au-incorporation in thin CsPbBr3 NPls, directing the formation of strong plexcitons by coupling between the localized surface plasmons of Au and the confined excitons in thin NPls. Here the plasmon induced electric field propagates through the NPls, thus altering the dielectric field strengths responsible for such elevated exciton binding energy and introducing additional screening effects to the excitons. In turn, the exciton binding energy reduces significantly, hindering the exciton–phonon interaction. Moreover, the weakened exciton binding energy extends the exciton lifetime and increases the free carrier yield, which shows a clear thickness dependence, highlighting their promising applications in nonlinear optoelectronics.

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来源期刊
The Journal of Physical Chemistry Letters
The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
9.60
自引率
7.00%
发文量
1519
审稿时长
1.6 months
期刊介绍: The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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