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Question
Answer
Question
二极管正向偏置时扩散电流和漂移电流的特征:
[...]
Answer
扩散电流:外接电源的电压和耗尽区内建电压的方向相反,所以外接电源电压会中和减弱内建电压的大小。根据公式
\(\displaystyle C=\frac{Q}{U}\)
,电压减小,电荷也减小,所以二极管两侧扩散到对侧的空穴和电子也减少,这减小了耗尽区的宽度,因为空穴和电子扩散的方向和减小的内建电压方向相反,所以增强了空穴和电子的扩散,扩散电流增大.
漂移电流:耗尽区电压变小,内建电场变大,因电场漂移而形成的漂移电流变小
Question
二极管正向偏置时扩散电流和漂移电流的特征:
[...]
Answer
?
Question
二极管正向偏置时扩散电流和漂移电流的特征:
[...]
Answer
扩散电流:外接电源的电压和耗尽区内建电压的方向相反,所以外接电源电压会中和减弱内建电压的大小。根据公式
\(\displaystyle C=\frac{Q}{U}\)
,电压减小,电荷也减小,所以二极管两侧扩散到对侧的空穴和电子也减少,这减小了耗尽区的宽度,因为空穴和电子扩散的方向和减小的内建电压方向相反,所以增强了空穴和电子的扩散,扩散电流增大.
漂移电流:耗尽区电压变小,内建电场变大,因电场漂移而形成的漂移电流变小
Summary
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