Probing the Interlayer Coupling of Twisted Bilayer MoS2 Using Photoluminescence Spectroscopy
Nano Letters2014Vol. 14(10), pp. 5500–5508
Citations Over TimeTop 10% of 2014 papers
Shengxi Huang, Xi Ling, Liangbo Liang, Jing Kong, Humberto Terrones, Vincent Meunier, M. 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.
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