Interlayer Difference of Bilayer-Stacked MoS2 Structure: Probing by Photoluminescence and Raman Spectroscopy

Nanomaterials

Xiangzhe Zhang¹  Shiqiao Qin¹  Renyan Zhang¹  Chuyun Deng²  Hang Yang²  Xiaoming Zheng²  Yi Zhang²  Xueao Zhang³ 

[1] College of Advanced Interdisciplinary Research, National University of Defense Technology, Changsha 410073, China;College of Arts and Science, National University of Defense Technology, Changsha 410073, China;College of Physical Science and Technology, Xiamen University, Xiamen 361000, China;

关键词: film–substrate interaction;    photoluminescence;    Raman spectroscopy;    molybdenum disulfide;    bilayer-stacked structure;   

DOI  :  10.3390/nano9050796

来源: DOAJ

【 摘 要 】

This work reports the interlayer difference of exciton and phonon performance between the top and bottom layer of a bilayer-stacked two-dimensional materials structure (BSS). Through photoluminescence (PL) and Raman spectroscopy, we find that, compared to that of the bottom layer, the top layer of BSS demonstrates PL redshift, Raman ${\mathrm{E}}_{2\mathrm{g}}^1$ mode redshift, and lower PL intensity. Spatial inhomogeneity of PL and Raman are also observed in the BSS. Based on theoretical analysis, these exotic effects can be attributed to substrate-coupling-induced strain and doping. Our findings provide pertinent insight into film−substrate interaction, and are of great significance to researches on bilayer-stacked structures including twisted bilayer structure, Van der Waals hetero- and homo-structure.

【 授权许可】

Unknown