In the presence of impurities or in a nonstoichiometric solid, free electrons or electron holes are produced as a result of “charge compensation” to neutralize the effect of charged ionic defects 。
在杂质存在情况下,或在非化学计量比,了电离子缺陷所引起电荷不平衡,便会产生自由电子或电子空穴。
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