Abstract
Heterostructures based on two-dimensional (2D) materials have attracted intense attention in recent decades due to their unusual and tunable physics/chemical properties, which can be converted into promising engineering applications ranging from electronics, photonics, and phononics to energy recovery. A fundamental understanding of thermal transport in 2D heterostructures is crucial importance for developing micro-nano devices based on them. In this review, we summarized the recent advances of thermal transport in 2D heterostructures. Firstly, we introduced diverse theoretical approaches and experimental techniques for thermal transport in low-dimensional materials. Then we briefly reviewed the thermal properties of various 2D single-phase materials beyond graphene such as hexagonal boron nitride (h-BN), phosphorene, transition metal dichalcogenides (TMDs) and borophene, and emphatically discussed various influencing factors including structural defects, mechanical strain, and substrate interactions. Moreover, we highlighted thermal conduction control in tailored nanosystems—2D heterostructures and presented the associated underlying physical mechanisms, especially interface-modulated phonon dynamics. Finally, we outline their significant applications in advanced thermal management and thermoelectrics conversion, and discuss a number of open problems on thermal transport in 2D heterostructures.
Highlights
The excellent physicochemical properties of graphene have inspired great interest in its fundamental and applied aspects, and in exploring other two-dimensional (2D) materials
Benefited from the progresses in the microtechnology, high-quality graphene/ hexagonal boron nitride (h-BN) in-plane heterostructures can be synthesized via chemical vapor deposition (CVD) method, and their compositional and structural diversities could translate into greater freedom for tuning the physical properties such as the presence of a metal-insulator transition (Ci et al, 2010; Liu et al, 2014d)
Compared to in-plane heterostructures which demands the matched lattice structures of constituent materials, van der Waals (vdW) heterostructures intrinsically create an ultraclean interface regardless of the typical interfacial latticematching constraints, which is crucial for tunneling devices that suffer from interfacial defects and dislocations
Summary
The excellent physicochemical properties of graphene (superior thermal stability, high conductivity, favorable mechanical strength, broadband absorption) have inspired great interest in its fundamental and applied aspects, and in exploring other two-dimensional (2D) materials. Compared to the zero band-gap of graphene, MoS2 exhibit direct band gap, making it an attractive material for nanoelectronic applications like field-effect transistors with a high on–off ratio and low power consumption (Chang et al, 2013) Another example, stanene, a single-layer buckled honeycomb structure of Tin atom, is demonstrated to be near-room-temperature quantum anomalous Hall effect (Wu et al, 2014) and ultra-low thermal conductivity (Cherukara et al, 2016), which is suited for thermoelectric devices. The structural diversities combined with structural defect and external stress field can realize the rich diversity of thermal properties in 2D heterostructures, and enables them to be used in different thermal fields From another perspective, the interfaces of heterostructures make the thermal transport mechanisms deviate from that in single 2D materials and conventional bulk materials, either through inducing a contact thermal resistance or new phonon modes. We show the potential applicability of 2D heterostructures in advanced thermal and thermoelectrics devices, and give the conclusions and a brief outlook
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