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[Guilin Sun]

CHARGE 只仿真半导体材料，金属和绝缘体都是理想的不参与离散网格而是理论计算。因此，任何材料要能传输电荷，就必须有半导体材料的性质参数。

https://optics.ansys.com/hc/en-us/articles/360034919133-Tips-for-creating-a-new-semiconductor-material 
Note: For the solver to run properly, you have to enable one of the conduction band (Ec) valleys (e.g. Gamma) and make the mobility for electrons and holes non-zero (e.g. ~1). Also make sure to define a nonzero carrier lifetime (or disable the recombination rates altogether).