Quasi-two-dimensional semiconductor nanoplatelets (NPLs) are intriguing systems for studying the influence of Auger recombination processes on the multiexciton emission efficiencies in the weak in-plane confinement regime. We investigate CdSe/CdS core/shell NPLs using cryogenic temperature single particle spectroscopy and observe bright biexciton emission at high excitation powers. The average binding energy of the biexcitons is determined to be 16.5 meV. The observed switching between the biexciton and trion states indicates charging-decharging dynamics of the NPLs mediated by the Auger ionization process. These findings are highly relevant for harvesting efficient biexciton emission for energy, lighting, and quantum applications.

中文翻译：

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单个半导体纳米片的双激子发射的观察

准二维半导体纳米薄片（NPL）是一种有趣的系统，用于研究弱平面内约束条件下俄歇复合过程对多激子发射效率的影响。我们使用低温温度单粒子光谱研究CdSe / CdS核/壳NPL，并在高激发功率下观察到明亮的双激子发射。测定双激子的平均结合能为16.5meV。观察到的在双激子和三重子态之间的转换表明由俄歇电离过程介导的不良贷款的充放电动力学。这些发现与为能量，照明和量子应用收集有效的双激子发射非常相关。