Two-Dimensional Hexagonal Boron Nitride for Building Next-Generation Energy-Efficient Devices

Abstract

Advances in the optoelectronics and information industries have allowed modern electronic devices to undergo a continuous trend toward miniaturization and integration, which poses significant challenges to today’s manufacturing technologies. The rise of two-dimensional (2D) atomically crystalline materials offers new possibilities for the design and fabrication of devices at the micro- or nanoscale. Hexagonal boron nitride (hBN) is an important emerging candidate in the family of 2D materials; it holds many intriguing properties of far-reaching significance. Throughout the upsurge in research on 2D materials over the past few decades, 2D hBN has been a versatile platform for various applications. To offer some perspective on the promising attributes of hBN, in this Focus Review we take a snapshot of recent advances in its applications in optoelectronics and photonics, thermal management, batteries, and supercapacitors and provide an outlook on the prospects and remaining challenges for its successful implementation in next-generation energy-efficient devices.

Polarized Raman Scattering of In‐Plane Anisotropic Phonon Modes in α‑MoO3

“…Optically anisotropic van der Waals materials, or more specifically, natural hyperbolic materials hold a great promise for many optical effects that were implausible in the past. [1][2][3][4][5] Orthorhombic molybdenum trioxide (α-MoO 3 ) is a biaxial van der Waals polar crystal, which has been recently discovered to be able to support highly anisotropic phonon polaritons plate can be inserted into the polarized Raman setup to achieve real-time in situ measurements without moving or rotating the sample stage.…”

“…Optically anisotropic van der Waals materials, or more specifically, natural hyperbolic materials hold a great promise for many optical effects that were implausible in the past. [ 1–5 ] Orthorhombic molybdenum trioxide (α‐MoO 3 ) is a biaxial van der Waals polar crystal, which has been recently discovered to be able to support highly anisotropic phonon polaritons (PhPs)—an elementary excitation generated from the coupling of electromagnetic fields and optical phonons. [ 6,7 ] These polaritons with in‐plane anisotropy or hyperbolicity are endowed with strong field confinement, ultralow loss, and long lifetime, which allows the nanoscale light manipulation and directional energy flow, thus making α‐MoO 3 a promising material platform for planar metaoptics.…”

Perspectives of 2D Materials for Optoelectronic Integration

“…Beyond graphene, a multitude of 2D materials with various optoelectronic properties have been explored, including insulators (for instance, h-BN [81,82] ), semiconductors (for instance, TMDCs, [83][84][85] BP, [86][87][88] silicene and germanium, [89,90] arsenene and antimonene, [91,92] etc. ), and superconductors (for instance, Mo 2 C, [93] atomically thin Ga, [94] etc.).…”

Graphene: Hexagonal Boron Nitride Composite Films with Low-Resistance for Flexible Electronics

“…At present, h-BN:graphene composites are widely studied to control the thermal conductivity of the composite material [ 17 , 18 ]. The thermal conducting properties of h-BN in composites minimize the thermal interface resistance and increase the phonon conduction.…”