Changes in the Photoluminescence of Monolayer and Bilayer Molybdenum Disulfide during Laser Irradiation

被引:14
作者
Kim, Ho-Jong [1 ,2 ]
Yun, Yong Ju [3 ]
Yi, Sam Nyung [4 ]
Chang, Soo Kyung [2 ]
Ha, Dong Han [1 ]
机构
[1] Korea Res Inst Stand & Sci, Quantum Technol Inst, Daejeon 34113, South Korea
[2] Yonsei Univ, Dept Phys, Seoul 03722, South Korea
[3] Konkuk Univ, Dept Energy Engn, Seoul 05029, South Korea
[4] Korea Maritime & Ocean Univ, Dept Elect Mat Engn, Busan 49112, South Korea
来源
ACS OMEGA | 2020年 / 5卷 / 14期
关键词
RAMAN-SPECTROSCOPY; MOS2; TRANSITION; GENERATION; THICKNESS; TRIONS;
D O I
10.1021/acsomega.9b04202
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Various postsynthesis processes for transition metal dichalcogenides have been attempted to control the layer number and defect concentration, on which electrical and optical properties strongly depend. In this work, we monitored changes in the photoluminescence (PL) of molybdenum disulfide (MoS2) until laser irradiation generated defects on the sample flake and completely etched it away. Higher laser power was required to etch bilayer MoS2 compared to monolayer MoS2. When the laser power was 270 mu W with a full width at half-maximum of 1.8 mu m on bilayer MoS2, the change in PL intensity over time showed a double maximum during laser irradiation due to a layer-by-layer etching of the flake. When the laser power was increased to 405 mu W, however, both layers of bilayer MoS2 were etched all at once, which resulted in a single maximum in the change of PL intensity over time, as in the case of monolayer MoS2 . The dependence of the etching pattern for bilayer MoS2 on laser power was also reflected in position changes of both exciton and trion PL peaks. The subtle changes in the PL spectra of MoS2 as a result of laser irradiation found here are discussed in terms of PL quantum efficiency, conversion between trions and excitons, mean interatomic spacing, and the screening of Coulomb interaction.
引用
收藏
页码:7903 / 7909
页数:7
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