Question

Describe the thermal production of charge carriers in a semiconductor and how this process limits the operation of a semiconductor device. 

   Describe the thermal production of charge carriers in a semiconductor and how this process limits the operation of a semiconductor device.
Principles and Applications of Electrical Engineering
Principles and Applications of Electrical Engineering
Giorgio Rizzoni,… 7th Edition
Chapter 8, Problem 4 ↓
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Describe the thermal production of charge carriers in a semiconductor and how this process limits the operation of a semiconductor device.
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a-in-your-own-words-explain-how-donor-impurities-in-semiconductors-give-rise-to-free-electrons-in--2

(a) In your own words, explain how donor impurities in semiconductors give rise to free electrons in numbers in excess of those generated by valence band-conduction band excitations. (b) Also, explain how acceptor impurities give rise to holes in numbers in excess of those generated by valence band-conduction band excitations.

Materials Science and Engineering

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00:01 All right guys, this question has two parts.
00:04 So let us write the answer of part a first.
00:10 And the answer is the impurities can change the conduction property of the semiconductors.
00:20 The impurities can change the conduction property of the semiconductors.
00:44 The semi -conductor pentavalent impurities are those with five valence electron pentavalent impurities are those with five valence electrons electrons but if the fifth electron is left to be free but if the fifth but if the fifth electron is left to be free because of negative charge because of negative charge there can be created for valence electrons there can be created created four valence electron that is bounding four neighboring semiconductors.
03:07 That is bounding four neighboring semiconductors.
03:38 So guys, this was the answer to part a...
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