目前对氮化硅材料的电子结构和光学性质的第一性原理研究较少，特别是碳掺杂的氮化硅材料的第一性原理研究更少。
However, the electrical structure and optical properties of Si3N4 have not been investigated in detail by the first principles theory.
目前对氮化硅材料的电子结构和光学性质的第一性原理研究较少，特别是碳掺杂的氮化硅材料的第一性原理研究更少。
However, the electrical structure and optical properties of Si3N4 have not been investigated in detail by the first principles theory.
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