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N型半导体是在本征半导体中掺入极微量的 价元素组成的。这种半导体内的多数载流子为 ,少数载流子为 ,不能移动的杂质离子带 正 电。P型半导体是在本征半导体中掺入极微量的 价元素组成的,这种半导体内的多数载流子为 ,少数载流子为 ,不能移动的杂质离子带 负 电。
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