Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion
Discussion Forum : Electronic Devices and Circuits - Section 1 (Q.No. 11)
11.
At very high temperatures the extrinsic semi conductors become intrinsic because
Answer: Option
Explanation:
Covalent bonds are broken.
Discussion:
10 comments Page 1 of 1.
Bhavya said:
3 weeks ago
Because the increased thermal energy leads to a dominant number of thermally generated charge carriers that overshadow the carriers introduced by doping.
Sankar said:
4 years ago
As temperature increases breaking of covalent bonds increases due to this both the majority and minority carriers of extrinsic semiconductor increases. At some temp minority carries will be equal to majority carries. It means majority carriers due to doping is neglected so extrinsic semiconductor acts as an intrinsic semiconductor.
(4)
Ash said:
7 years ago
Thanks all for explaining this.
(1)
Avinash said:
8 years ago
As the temperature increase beyond 300K then the conductivity of extrinsic semiconductor decrease because fermi level moving towards the energy gap (depend upon n/ p) no free electron is available. After curie temp, Conductivity further increases because fermi level move to the either CB or VB.
Jagdeep singh said:
9 years ago
Fermi an energy level, which is used to describe the top of the collection of electron energy levels at absolute zero temperature.
John said:
10 years ago
What is fermi level?
Jyoti said:
10 years ago
200*c for silicon & 85*c for germanium.
Priya singh said:
1 decade ago
What is the maximum temp?
Swatantra said:
1 decade ago
As temp. Increases in the extrinsic semiconductor fermi level moves toward the intrinsic level this is known as the band to band transition.
(3)
ITI SARIN said:
1 decade ago
Can someone elaborate the answer as I m not getting the exact meaning of band to band transition over impurity ionization?
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