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(Color online) Bandgap in N δ-doping graphene with different N contents. Inset is the schematic diagram of central N δ-doping AGNR. The region in rectangular solid line refers to the unit cell of N δ-doping graphene (N-G(3)).
(Color online) (a) Bandgaps of N δ-doping and intrinsic AGNRs. (b) Difference of bandgaps between N δ-doping and intrinsic AGNRs.
(Color online) Band structures of N-AGNRs with different width. The shifts (Δk) of the valence band maximum from Γ point indicate the direct to indirect band transition after N δ-doping. The Fermi level is set to zero.
(Color online) Shift of Fermi level between N δ-doping and intrinsic AGNRs.
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