Twist angle provides a new degree of freedom for 2D material modifications. In principle, the intrinsic properties of twisted multilayers can be regulated by twist angle between each adjacent layer and thus have greater tunability than widely studied bilayer structures. Considering its complexity, it is important to first investigate the simplest twisted multilayers with only one interface twisted. In this work, multilayer Moiré superlattices with only one twisted interface via paraffin-assisted folding of non-twisted stacked (highly symmetrically stacked) multilayer MoS2 are successfully fabricated, and their twist-angle dependent optical properties are systematically studied. Compared to non-twisted stacked multilayer MoS2, the one-interface-twisted multilayers show a 2–3.5 times higher PL intensity, and their interlayer coupling, indirect bandgap, and degree of circular polarization (DOCP) are tunable by twist angle. Notably, the DOCP for the one-interface-twisted four-layer (folded bilayer) can reach 86%, which is the highest value ever reported for transition metal dichalcogenide homostructures above liquid nitrogen temperature. This work provides a solid base for understanding twist-angle dependent properties of twisted multilayer 2D-materials.
|Journal||Advanced Functional Materials|
|Publication status||Published - 2022 May 9|
Bibliographical noteFunding Information:
W.Z. and H.H. contributed equally to this work. This work was supported by National Natural Science Foundation of China (21903007, 22072006), Young Thousand Talents Program (110532103), Beijing Normal University Startup funding (312232102), Beijing Municipal Science & Technology Commission (No. Z191100000819002), and the Fundamental Research Funds for the Central Universities (310421109). Y.L. and K.K. acknowledge support from the Basic Science Research Program at the National Research Foundation of Korea (NRF-2019R1C1C1003643 and NRF-2021R1C1C2006785).
© 2022 Wiley-VCH GmbH.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics