Chen Shihong, Sun Zejun, Liu Huan, Xu Haowen, Wang Chong, Han Rui, Wang Zihao, Huang Shuchun, Zhao Xiaoliang, Chen Zekai, Li Weizhou, Liu Dameng
School of Resources, Environment and Materials, Guangxi University, Guangxi, Nanning 530004, P.R. China.
State Key Laboratory of Tribology in Advanced Equipment, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
Nanoscale. 2024 Jul 25;16(29):14089-14095. doi: 10.1039/d4nr00661e.
The interlayer twist angle has a direct effect on exciton lifetimes in van der Waals heterostructures. At small angles, the interlayer and intralayer excitons in MoSe/WS heterostructures are hybridized, resulting in hybridized excitons with long lifetimes and strong resonance. However, the study of twist-angle modulation of hybridized exciton lifetimes is still insufficient, leading to an unclear understanding of the mechanism through which the twist angle between layers influences the lifetime of hybridized excitons. Here, we observed the formation of hybridized excitons by constructing MoSe/WS heterostructures with different twist angles. The exciton lifetime is found to increase from 0.5 ns to 3.3 ns when the twist angle is reduced from 12° to 1°. This work provides a new perspective on the modulation of the exciton lifetime, enabling further exploration in improving the efficiency of optoelectronic devices.
层间扭转角对范德华异质结构中的激子寿命有直接影响。在小角度下，MoSe₂/WS₂异质结构中的层间和层内激子发生杂化，产生具有长寿命和强共振的杂化激子。然而，对杂化激子寿命的扭转角调制研究仍不充分，导致对层间扭转角影响杂化激子寿命的机制理解不清。在此，我们通过构建具有不同扭转角的MoSe₂/WS₂异质结构观察到了杂化激子的形成。当扭转角从12°减小到1°时，激子寿命从0.5 ns增加到3.3 ns。这项工作为激子寿命调制提供了新的视角，有助于在提高光电器件效率方面进行进一步探索。
