摘要
This study reveals that the interaction between a 2D material and its substrate can significantly modify its electronic and optical properties, and thus can be used as a means to optimize these properties. High-temperature （25-500℃） optical spectroscopy, which combines Raman and photoluminescence spectroscopies, is highly effective for investigating the interaction and material properties that are not accessible at the commonly used cryogenic temperature （e.g., a thermal activation process with an activation of a major fraction of the bandgap）. This study investigates a set of monolayer WS2 films, either directly grown on sapphire and SiO2 substrates by CVD or transferred onto SiO2 substrate. The coupling with the substrate is shown to depend on the substrate type, the material- substrate bonding （even for the same substrate）, and the excitation wavelength. The inherent difference in the states of strain between the as-grown and the transferred films has a significant impact on the material properties.
这研究表明在 2D 材料和它的底层之间的相互作用能显著地修改它的电子、光的性质，并且能因此被用作一个工具优化这些性质。高温度(25500 灭獯瑩 ? 慭牴硩 ? 桔 ? 楤' 湛?慣慰楣楴獥漠 ? 桴 ? 潍 ? ??? 猯'T?? 潣灭獯瑩 ?
