半導體與PN二極體疑問 - 考試
By Candice
at 2013-12-07T18:10
at 2013-12-07T18:10
Table of Contents
1.http://ppt.cc/qipq
上面那題說P型半導體帶正電荷那就是帶正電
可是下面那題為何又說P型半導體是電中性?
2.http://ppt.cc/Zp8Q
這題一開始在P區外加很多的電洞所以NA的值變大導致黑筆部分那項可以趨近為0
那這樣子不就是由ND來決定逆向電流嗎?
ND大小決定於在N區加入的電子數,那這樣答案不是B嗎?為何是A?
3.為什麼PN二極體順向電壓時不用考慮空乏區的厚度而逆向電壓時要考慮呢?
謝謝
--
上面那題說P型半導體帶正電荷那就是帶正電
可是下面那題為何又說P型半導體是電中性?
2.http://ppt.cc/Zp8Q
這題一開始在P區外加很多的電洞所以NA的值變大導致黑筆部分那項可以趨近為0
那這樣子不就是由ND來決定逆向電流嗎?
ND大小決定於在N區加入的電子數,那這樣答案不是B嗎?為何是A?
3.為什麼PN二極體順向電壓時不用考慮空乏區的厚度而逆向電壓時要考慮呢?
謝謝
--
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考試
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