Two-dimensional Be₂Al and Be₂Ga monolayer: anti-van’t Hoff/Le Bel planar hexacoordinate bonding and superconductivity

Abstract

Because of the electron deficiency of boron, the triangular network with planar hexacoordination is the most common structural and bonding properties for the isolated boron clusters and two-dimensional (2D) boron...

Ohmic contacts of the two-dimensional Ca2N/MoS2donor–acceptor heterostructure

“…34 In the case of Ca 2 N or [Ca 2 N] + · e − , for example, the anionic electrons are delocalized in the interstitial space between two adjacent Ca 2 N layers, the positively charged [Ca 2 N] + layer alternates with a delocalized e − layer, forming nearly free 2D electron gas. 35–38 In experiments, the carrier concentration of Ca 2 N is up to nearly 10 15 cm −2 , which is 1000 times higher than that of undoped graphene. 39 In addition, the ultra-low work function of Ca 2 N provides a great driving force for electron donation, which means that Ca 2 N can act as an exceptional electron donor.…”