With sufficient forward bias, the diffusion capacitance can easily exceed the space charge region capacitance. 当正向偏压足够高时，扩散电容很容易超过空间电荷压电容。
Second, the formation of the saturation current affected by the space charge effect and bunching effect is studied in details. 进而详细研究了在空间电荷效应作用及相聚过程共同作用下形成饱和电流的过程。
