Lu Dongxiao, Zhou Qiang, Li Fangfei, Li Xiaowei, Lu Geyu
State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University 2699 Qianjin Street Changchun 130012 China
Nanoscale Adv. 2018 Dec 17;1(3):1186-1192. doi: 10.1039/c8na00086g. eCollection 2019 Mar 12.
Interlayer interactions play a crucial role in modifying the optical and electronic properties of layered materials in a complex way, which is of key importance for the performance of the optoelectronic devices based on these novel materials. In this contribution, we performed an investigation into the underlying influence of interlayer interactions on the relaxation dynamics of excitons in ultrathin MoS using the femtosecond transient absorption spectroscopy technique. The experimental results manifest that interlayer interactions in bilayer MoS can largely facilitate the exciton-phonon scattering process and inhibit the radiative recombination process, which consequently accelerates the relaxation rate of A excitons and results in the decrease of the relaxation lifetime of A excitons in bilayer MoS.
层间相互作用在以复杂方式改变层状材料的光学和电子特性方面起着至关重要的作用，这对于基于这些新型材料的光电器件的性能至关重要。在本论文中，我们使用飞秒瞬态吸收光谱技术研究了层间相互作用对超薄MoS₂中激子弛豫动力学的潜在影响。实验结果表明，双层MoS₂中的层间相互作用可以极大地促进激子 - 声子散射过程并抑制辐射复合过程，从而加速A激子的弛豫速率，并导致双层MoS₂中A激子弛豫寿命的降低。
