CBSE Class 12-science Answered
why is the direction of electric field marked as positive to negative in the depletion region?
Asked by Anirudh | 16 Aug, 2017, 10:40: AM
Expert Answer
1) Electric field is always directed from the positive charge to the negative charge. So, the direction is as given in the figure in the textbook.
2) In the depletion zone, the holes from 'p' move towards the 'n' region and the electrons from 'n' region move towards the 'p' region. This is why a depletion region is formed.
3) Because of this electric field, a good amount of forward bias voltage is needed before the semiconductor starts conducting.
Answered by Romal Bhansali | 16 Aug, 2017, 01:42: PM
Concept Videos
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p-n Diode - Part 1
This video explains the basics of a pn junction. -
p-n Diode - Part 2 ...
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PN Diode
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