Influence of local structures on the energy transfer efficiencies of quantum-dot films
Influence of local structures on the energy transfer efficiencies of quantum-dot films
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DOI：
10.1103/physrevb.102.035437
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发表时间：
2020-07
影响因子：
3.7
通讯作者：
Lintao Peng;Xuedan Ma;Hua Zhu;Ou Chen;Wei Wang
中科院分区：
文献类型：
--
作者：
Lintao Peng;Xuedan Ma;Hua Zhu;Ou Chen;Wei Wang
能量传递是一个重要的光物理过程，在决定许多光电子器件和光捕获器件的性能方面起着重要的作用。结合载流子动力学测量和蒙特卡罗模拟，我们研究了局域微观结构对量子点薄膜能量转移效率的影响。我们发现，在薄膜中，局域的形成导致了能量传递效率的降低，尽管宏观上能量传递速率保持不变。与堆积密度相比，垂直层间能量传递对结构整体能量传递效率的影响较小。在厚的三维薄膜中，能量传递的速度超过了双激子复合的速度，这表明在量子点薄膜中获得多激子用于器件应用的可能性。
Energy transfer is an important photophysical process that plays a significant role in determining the performance of many optoelectronic and light-harvesting devices. Combining carrier dynamics measurements with Monte Carlo simulations, we study the influence of local microscopic structures on energy transfer efficiencies in quantum-dot films. We find that in thin films, the formation of local domains leads to reduced energy transfer efficiencies, even though macroscopically the energy transfer rate remains intact. Compared to packing density, the vertical interlayer energy transfer has a small impact on the overall energy transfer efficiencies in our structures. In thick three-dimensional films, energy transfer outpaces biexciton recombination, suggesting the possibility to harvest multiexcitons in quantum-dot films for device applications.