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Zigzag edges of neutral armchair-oriented Graphene Nano-Ribbons show statesstrongly localized at those edges. They behave as free radicals that cancapture electrons during processing, increasing ribbon's stability. Thus,charging and its consequences should be investigated.Total energy calculationsof finite ribbons using spin polarized Density Functional Theory (DFT) showthat ribbon's charging is feasible. Energies for Pariser-Parr-Pople (PPP) modelHamiltonian are compatible with DFT allowing the study of larger systems.Results for neutral ribbons indicate: i) the fundamental gap of spin polarized(non polarized) solutions is larger (smaller) than experimental data, ii) theground state is spin polarized, a characteristic still not observedexperimentally. Total energy of GNRs decreases with the number of capturedelectrons reaching a minimum for a number that mainly depends on zigzag edgessize. The following changes with respect to neutral GNRs are noted: i) theground state is not spin polarized, ii) fundamental gap is in-between that ofspin polarized and non polarized solutions of neutral ribbons, iii) while inneutral ribbons valence and conduction band onsets vs. the fundamental gap,linearly and symmetrically approach mid-gap with slope 0.5, charging inducesFermi level pinning, i.e., the slopes of the valence and conduction bands beingabout 0.1 and 0.9, in agreement with experiment.

Electron enrichment of zigzag edges of armchair-oriented graphene nano-ribbons increases their stability and induces pinning of Fermi level