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 。
杂质存
情况
,
非化学计量比
固体中,
了中和带电离子缺陷所
电荷不平衡,便会产生自由电子
电子空穴。