Probing the Interlayer Coupling of Twisted Bilayer MoS2 Using Photoluminescence Spectroscopy

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• 作者：Shengxi Huang ; Xi Ling ; Liangbo Liang ; Jing Kong ; Humberto Terrones ; Vincent Meunier ; Mildred S. Dresselhaus
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：October 8, 2014
• 年：2014
• 卷：14
• 期：10
• 页码：5500-5508
• 全文大小：522K
• ISSN：1530-6992

文摘

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掳 or 60掳, while for the twisted angle 30掳 or 90掳 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.

Keywords:

Molybdenum disulfide; twisted bilayer; photoluminescence; exciton; trion; interlayer coupling