Solving Quantum-Dot Excitonic Riddles with Absolute Pump–Probe Spectroscopy,The Journal of Physical Chemistry Letters

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Solving Quantum-Dot Excitonic Riddles with Absolute Pump–Probe Spectroscopy
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-09-22 , DOI: 10.1021/acs.jpclett.1c02408
Sanford Ruhman ₁

Affiliation

Absolute absorption changes in molecular flash photolysis experiments are routinely translated into molar extinction coefficients and oscillator strengths of reactive intermediates. These direct quantum chemical investigation and allow precise concentration readings in later experiments. In this Perspective we show how a similar approach can deliver crucial information for interpreting transient absorption spectra in colloidal semiconductor quantum dots. The intrinsic complexity of such samples stemming from the inhomogeneity of particle size, shape, and surface chemistry poses unique challenges to mechanistic assignment of ultrafast pump–probe measurements. We will describe applications of this approach to elucidate the photophysics of quantum confined nanocrystals made of various semiconducting materials. These case studies demonstrate how, faced with conflicting interpretations, it has pointed in the right direction in assessing single and multiple exciton generation and relaxation, in searches for ultrafast carrier trapping and scavenging, and in tests of band edge level structure and state degeneracies.

中文翻译：

用绝对泵浦-探针光谱解决量子点激子之谜

分子闪光光解实验中的绝对吸收变化通常被转化为反应中间体的摩尔消光系数和振荡器强度。这些直接进行量子化学研究，并允许在以后的实验中获得精确的浓度读数。在这个视角中，我们展示了类似的方法如何为解释胶体半导体量子点中的瞬态吸收光谱提供关键信息。由于颗粒大小、形状和表面化学的不均匀性，此类样品的内在复杂性对超快泵-探针测量的机械分配提出了独特的挑战。我们将描述这种方法的应用，以阐明由各种半导体材料制成的量子限制纳米晶体的光物理学。这些案例研究展示了如何，

更新日期：2021-09-30

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