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To identify the origins of the gap states found in valence
band, theoretical simulation with density functional theory
methods were used to compute the molecular orbitals
(MOs) and simulated density of states. The optimized geometric structures were obtained with the method of B3-
LYP and the basis set of 6-31G, and the single-point energy
was then applied to retrieve the detail information of
molecular energy using Gaussian03 software [17]. The
simulated valence-band spectra using calculated MOs
was extracted via GaussSum [18] with full-width-at-halfmaximum of 0.4 eV.

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