Atomic and Electronic Properties of 2D Moiré Interfaces(Springer Theses)

二维莫尔界面的原子与电子特性

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作      者
出  版 社
出版时间
2022年09月14日
装      帧
精装
ISBN
9783031120923
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页      码
176
语      种
英文
版      次
1
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图书简介
This thesis provides the first atomic length-scale observation of the structural transformation (referred to as lattice reconstruction) that occurs in moiré superlattices of twisted bilayer transition metal dichalcogenides (TMDs) at low (θ < 2˚) twist angles. Studies using Scanning transmission electron microscopy (STEM) were limited due to the complexity of the (atomically-thin) sample fabrication requirements. This work developed a unique way to selectively cut and re-stack monolayers of TMDs with a controlled rotational twist angle which could then be easily suspended on a TEM grid to meet the needs of the atomically thin sample requirements. The fabrication technique enabled the study of the two common stacking-polytypes including 3R and 2H (using MoS2 and WS2 as the example) as well as their structural evolution with decreasing twist-angle.Also reported is a comprehensive investigation of electronic properties using scanning probe microscopy and electrical transport measurements of the artificially-engineered structures. These and other studies highlight the unique intrinsic properties of TMDs and their potential application in the development of the next generation of optoelectronics.
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