Nitrogen doping in purely ${\mathrm{sp}}^2$ bonded forms of carbon

We postulate wide-band-gap forms of carbon that locally have a planar bonding configuration as in graphite and, in contrast to diamond, are promising candidates for $n$-type doping by nitrogen. The presence of localized $\pi$ bonds makes them as stable as fullerene ${\mathrm{C}}_{60}$ and causes large band gaps of $\approx 3$ eV to appear. The allotropes accept both nitrogen and boron as substitutional dopants, making them potentially extremely useful for high-power, high-temperature, and high-speed device applications.