Investigation of Hot Carrier Cooling Dynamics in Monolayer MoS2,The Journal of Physical Chemistry Letters

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Investigation of Hot Carrier Cooling Dynamics in Monolayer MoS2
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-01-11 , DOI: 10.1021/acs.jpclett.0c03110
Wenyan Wang ₁ , Ning Sui ₁ , Xiaochun Chi ₁ , Zhihui Kang ₁ , Qiang Zhou ₂ , Li Li ₃ , Hanzhuang Zhang ₁ , Jianbo Gao ₄ , Yinghui Wang ₁

Affiliation

The hot carrier cooling dynamics in the C-excitonic state of monolayer MoS₂ is slowed down by the hot phonon bottleneck and Auger heating effects, as exploited by ultrafast transient absorption spectroscopy. The hot carrier cooling process, determined by the hot phonon bottleneck, can be prolonged through rising the excitation photon energy or increasing the absorbed photon flux. By inducing the Auger heating effect under higher absorbed photon flux, the hot carrier lifetime also increases at the low excitation photon energy. When these two effects are combined under higher excitation photon energy and higher absorbed photon flux, the hot phonon bottleneck is gradually weakened because of Auger recombination. In addition, the similar hot carrier phenomenon can be observed in A/B excitonic states owing to the same physical mechanism. Our work establishes a solid photophysics foundation for 2D transition-metal dichalcogenide applications in advanced energy conversion, optical quantum communication, quantum technology, etc.

中文翻译：

单层MoS ₂热载流子冷却动力学研究

C激子态单层MoS ₂的热载流子冷却动力学超快瞬态吸收光谱法利用热声子瓶颈和俄歇热效应减慢了光的吸收。由热声子瓶颈决定的热载流子冷却过程可以通过增加激发光子能量或增加吸收的光子通量来延长。通过在较高的吸收光子通量下诱导俄歇热效应，在低激发光子能量下，热载流子的寿命也增加了。当在较高的激发光子能量和较高的吸收光子通量下将这两种效应结合在一起时，由于俄歇复合，热声子瓶颈逐渐减弱。此外，由于相同的物理机制，在A / B激子态下也可以观察到类似的热载流子现象。等。

更新日期：2021-01-21

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