Experimental study of thermal rectification in suspended monolayer graphene

The discovery of graphene has stimulated the search for and investigations into other 2D materials because of the rich physics and unusual properties exhibited by many of these layered materials. Transition metal dichalcogenides (TMDs), black phosphorus, and SnSe among many others, have emerged to show highly tunable physical and chemical properties that can be exploited in a whole host of promising applications. Alongside the novel electronic and optical properties of such 2D semiconductors, their thermal transport properties have also attracted substantial attention. Here, a comprehensive review of the unique thermal transport properties of various emerging 2D semiconductors is provided, including TMDs, black‐ and blue‐phosphorene among others, and the different mechanisms underlying their thermal conductivity characteristics. The focus is placed on the phonon‐related phenomena and issues encountered in various applications based on 2D semiconductor materials and their heterostructures, including thermoelectric power generation and electron–phonon coupling effect in photoelectric and thermal transistor devices. A thorough understanding of phonon transport physics in 2D semiconductor materials to inform thermal management of next‐generation nanoelectronic devices is comprehensively presented along with strategies for controlling heat energy transport and conversion.

Section: Phonon‐driven Emerging Applications Of 2d Semiconductorsmentioning

confidence: 99%

Thermal Transport in 2D Semiconductors—Considerations for Device Applications

Zhao

Cai

Zhang

et al. 2019

“…Since the first observation of thermal rectification by Starr in 1936, thermal rectification has been realized through various mechanisms: asymmetric nanostructured geometry, evaporation/condensation, infrared emission, temperature dependence of thermal conductivity, mechanical tensile strain and an imperfect interface junction, as well as nonlinear lattice models, as reviewed in the literature . Based on the mechanism of the temperature dependence of thermal conductivity, a thermal diode can be realized by coupling two materials with different temperature dependences of thermal conductivities.…”

Section: Applications Of Pcms With Tuned Thermal Conductivitymentioning

confidence: 99%

Engineering the Thermal Conductivity of Functional Phase‐Change Materials for Heat Energy Conversion, Storage, and Utilization

Yuan

Shi

Aftab

et al. 2019

269

136

Thermal energy storage technologies based on phase‐change materials (PCMs) have received tremendous attention in recent years. These materials are capable of reversibly storing large amounts of thermal energy during the isothermal phase transition and offer enormous potential in the development of state‐of‐the‐art renewable energy infrastructure. Thermal conductivity plays a vital role in regulating the thermal charging and discharging rate of PCMs and improving the heat‐utilization efficiency. The strategies for tuning the thermal conductivity of PCMs and their potential energy applications, such as thermal energy harvesting and storage, thermal management of batteries, thermal diodes, and other forms of energy utilization, are summarized systematically. Furthermore, a research perspective is given to highlight emerging research directions of engineering advanced functional PCMs for energy applications.

“…In addition to studying the influence of shape on the thermal rectification characteristics of graphene, suspended graphene can also show good thermal rectification characteristics due to the influence of its own strain. In 2017, Wang et al experimentally demonstrated thermal rectification in various asymmetric monolayer graphene nanostructures ( Figure ). A large thermal rectification factor of 26% was achieved in a defect‐engineered monolayer graphene with nanopores on one side.…”

Section: Uncoupled Thermal Devicementioning

confidence: 99%

“…The solid lines are the theoretical predictions based on a lattice dynamics model. Reproduced under the terms and conditions of the Creative Commons Attribution 4.0 International License . Copyright 2017, Springer Nature.…”

Section: Uncoupled Thermal Devicementioning

confidence: 99%

Graphene‐Based Devices for Thermal Energy Conversion and Utilization

Tian

Sun

et al. 2019

Thermal energy conversion and utilization of integrated circuits is a very important research topic. Graphene is a new 2D material with superior electrical, mechanical, thermal, and optical properties, which is expected to continue Moore's law and make breakthroughs in the direction of “More than Moore.” Graphene‐based functionalized devices are applied in various aspects, including breakthroughs in thermal devices, due to their high thermal conductivity and thermal rectification. According to the coupling of different physical quantities, graphene‐based thermal devices can be divided into four categories: uncoupled thermal devices, thermoacoustic coupling devices, thermoelectric coupling devices, and thermo‐optical coupling devices. The structure, working mechanism, and performance of these devices are discussed, as well as the coupling methods of physical quantities. Moreover, scale‐up production of graphene and prospect for future graphene‐based thermal devices are summarized. In‐depth study of the development tendency of these graphene‐based thermal devices is expected to contribute to the development of new high‐performance thermal nanoelectronic devices in the future.