  Borophene (two-dimensional boron sheet) is a new type of two-dimensional
material, which was recently grown successfully on single crystal Ag
substrates. In this paper, we investigate the electronic structure and bonding
characteristics of borophene by first-principle calculations. The band
structure of borophene shows highly anisotropic metallic behaviour. The
obtained optical properties of borophene exhibit strong anisotropy as well. The
combination of high optical transparency and high electrical conductivity in
borophene makes it a promising candidate for future design of transparent
conductors used in photovoltaics. Finally, the thermodynamic properties are
investigated based on the phonon properties.
