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Under ab initio computations, several new inorganic electride compounds with high stability, M@x-Al₁₂N₁₂ (M = Li, Na, and K; x = b₆₆, b₆₄, and r₆), were achieved for the first time by doping the alkali metal atom M on the fullerene-like Al₁₂N₁₂ nanocage, where the alkali atom is located over the Al–N bond (b₆₆/b₆₄ site) or six-membered ring (r₆ site). It is revealed that independent of the doping position and atomic number, doping the alkali atom can significantly narrow the wide gap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) (E_H-L = 6.12 eV) of the pure Al₁₂N₁₂ nanocage in the range of 0.49–0.71 eV, and these doped AlN nanocages can exhibit the intriguing n-type characteristic, where a high energy level containing the excess electron is introduced as the new HOMO orbital in the original gap of pure Al₁₂N₁₂. Further, the diffuse excess …