Spatial Mapping of Hot-Spots at Lateral Heterogeneities in Monolayer Transition Metal Dichalcogenides
| Autor: | Poya Yasaei, Gajendra S. Shekhawat, Roberto dos Reis, Vinayak P. Dravid, Yaobin Xu, Akshay A. Murthy |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Heterojunction 02 engineering and technology Scanning thermal microscopy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Transition metal Mechanics of Materials Monolayer Nano Scanning transmission electron microscopy Optoelectronics General Materials Science Grain boundary 0210 nano-technology business Nanoscopic scale |
| Zdroj: | Advanced materials (Deerfield Beach, Fla.). 31(24) |
| ISSN: | 1521-4095 |
| Popis: | Lateral heterogeneities in atomically thin 2D materials such as in-plane heterojunctions and grain boundaries (GBs) provide an extrinsic knob for manipulating the properties of nano- and optoelectronic devices and harvesting novel functionalities. However, these heterogeneities have the potential to adversely affect the performance and reliability of the 2D devices through the formation of nanoscopic hot-spots. In this report, scanning thermal microscopy (SThM) is utilized to map the spatial distribution of the temperature rise within monolayer transition metal dichalcogenide (TMD) devices upon dissipating a high electrical power through a lateral interface. The results directly demonstrate that lateral heterojunctions between MoS2 and WS2 do not largely impact the distribution of heat dissipation, while GBs of MoS2 appreciably localize heating in the device. High-resolution scanning transmission electron microscopy reveals that the atomic structure is nearly flawless around heterojunctions but can be quite defective near GBs. The results suggest that the interfacial atomic structure plays a crucial role in enabling uniform charge transport without inducing localized heating. Establishing such structure-property-processing correlation provides a better understanding of lateral heterogeneities in 2D TMD systems which is crucial in the design of future all-2D electronic circuitry with enhanced functionalities, lifetime, and performance. |
| Databáze: | OpenAIRE |
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