Fig. 4: Representative atomic structures of BDG with varying boron concentrations.

Purple spheres denote carbon atoms and green spheres denote boron atoms; all panels show a 4 × 4 × 1 graphene supercell. a 3.12% (b) 6.25% (c) 9.37% (d) 12.50% (e) 15.62% (f) 18.75% (g) 21.88% (h) 25.00%.