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. 2015 Sep 18;5:14165. doi: 10.1038/srep14165

Figure 5. Formation energy of monovacancy vs. Fermi energy for monolayer, bilayer and bulk b-P.

Figure 5

The +/− charge transition level lies at 0.24eV above VBM in monolayer b-P. In 2-layer b-P the 0/− level lies at 0.2 eV above its VBM. In bulk b-P, only the V− state is stable.