| Literature DB >> 25171263 |
Shengxi Huang1, Xi Ling, Liangbo Liang, Jing Kong, Humberto Terrones, Vincent Meunier, Mildred S Dresselhaus.
Abstract
Two-dimensional molybdenum disulfide (MoS2) is a promising material for optoelectronic devices due to its strong photoluminescence emission. In this work, the photoluminescence of twisted bilayer MoS2 is investigated, revealing a tunability of the interlayer coupling of bilayer MoS2. It is found that the photoluminescence intensity ratio of the trion and exciton reaches its maximum value for the twisted angle 0° or 60°, while for the twisted angle 30° or 90° the situation is the opposite. This is mainly attributed to the change of the trion binding energy. The first-principles density functional theory analysis further confirms the change of the interlayer coupling with the twisted angle, which interprets our experimental results.Entities:
Keywords: Molybdenum disulfide; exciton; interlayer coupling; photoluminescence; trion; twisted bilayer
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Year: 2014 PMID： 25171263 DOI： 10.1021/nl5014597
Source DB: PubMed Journal: Nano Lett ISSN： 1530-6984 Impact factor: 11.189