2D Boron Sheets: Structure, Growth, and Electronic and Thermal Transport Properties

Abstract

The structures of boron clusters, such as flat clusters and fullerenes, resemble those of carbon. Various two‐dimensional (2D) borophenes have been proposed since the production of graphene. The recent successful fabrication of borophene sheets has prompted extensive researches, and some unique properties are revealed. In this review, the recent theoretical and experimental progress on the structure, growth, and electronic and thermal transport properties of borophene sheets is summarized. The history of prediction of boron sheet structures is introduced. Existing with a mixture of triangle lattice and hexagonal lattice, the structures of boron sheets have peculiar characteristics of polymorphism and show significant dependence on the substrate. Due to the unique structure and complex BB bonds, borophene sheets have many interesting electronic and thermal transport properties, such as strong nonlinear effect, strong thermal transport anisotropy, high thermal conductance in the ballistic transport and low thermal conductivity in the diffusive transport. The growth mechanism and synthesis of borophene sheets on different metal substrates are also presented. The successful prediction and synthesis will shed light on the exploration of new novel materials. Besides, the outstanding and peculiar properties of borophene make them tempting platform for exploring novel physical phenomena and extensive applications.

Effects of temperature and intrinsic structural defects on mechanical properties and thermal conductivities of InSe monolayers

“…From this table, it is observed that thermal conductivity of InSe is lower than that of graphene, phosphorene. The thermal conductivity of InSe is on the same magnitude as that of borophene 60 , however, the Young’s modulus of InSe is lower than that of borophene significantly 47 . The results implied InSe possesses the weaker phononic anharmonicity than borophene.…”

Significant enhancement of the thermoelectric properties of CaP3 through reducing the dimensionality

“…2D layered materials, such as single layer graphene [16][17][18] , silicene 19,20 , phosphorene 21,22 , borophene 23,24 , and a series of other layered materials [25][26][27] , have been systematically investigated in scientific community for using as TE materials. Recently, 2D triphosphides are reported one after another with fascinating properties, raising great concern 28,29 .…”

Effects of Divacancy and Extended Line Defects on the Thermal Transport Properties of Graphene Nanoribbons

“…Heat dissipation is the most important factor affecting and limiting the performance of modern electronic devices [31,32,33,34,35,36]. Thus, how divacancies affect heat transport performance of graphene and graphene nanodevices is an important question.…”