Silicene is a two-dimensional (2D) Si crystal one atomic layer thick, with a hexagonal honeycomb structure similar to that of graphene.

Reference : J. Sone et al., New Journal of Physics 16 (2014) 095004

Silicene is the silicon equivalent of graphene, which is composed of a honeycomb carbon structure with one atom thickness and has attractive characteristics of a perfect two-dimensional π-conjugated sheet.

Reference : M. Takahashi, Scientific Reports 7 (2017) 10855