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arXiv 1609.05077cond-mat.mtrl-sci
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原位监测热退火诱导的单层MoS2膜的膜形态和膜-基结合的演变

In-Situ Monitoring of Thermal Annealing Induced Evolution in Film Morphology and Film-Substrate Bonding in a Monolayer MoS2 Film

Liqin Su, Yifei Yu, Linyou Cao, Yong Zhang

摘要:

我们进行原位两个周期的热循环和退火的研究转移CVD生长的单层MoS 2的SiO2/Si衬底上,使用空间分辨显微拉曼光谱和PL光谱。在热循环和在305摄氏度下退火两次之后,膜形态和膜-基底结合被显著地改变,这与聚合物残留物的去除一起导致膜上的应变和掺杂分布的重大变化,并且因此光学性质。退火前,在转移膜中的波纹相关的应变占主导地位的PL峰的位置和强度的空间分布的膜;退火后,在膜-衬底键合的变化,影响应变和掺杂,成为主导因素。这项工作表明,薄膜-衬底键合,从而应变和掺杂,在热应力下是不稳定的,这对于理解衬底对2D材料的光学和输运性质的影响及其对器件应用的影响是重要的。

英文摘要:

We perform in-situ two-cycle thermal cycling and annealing studies for a transferred CVD-grown monolayer MoS2 on a SiO2/Si substrate, using spatially resolved micro-Raman and PL spectroscopy. After the thermal cycling and being annealed at 305 deg C twice, the film morphology and film-substrate bonding are significantly modified, which together with the removal of polymer residues cause major changes in the strain and doping distribution over the film, and thus the optical properties. Before annealing, the strain associated with ripples in the transferred film dominates the spatial distributions of the PL peak position and intensity over the film; after annealing, the variation in film-substrate bonding, affecting both strain and doping, becomes the leading factor. This work reveals that the film-substrate bonding, and thus the strain and doping, is unstable under thermal stress, which is important for understanding the substrate effects on the optical and transport properties of the 2D material and their impact on device applications.

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