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45. Semiconductors and Semiconductor Devices
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Q6 of 71 Page 416

What is the resistance of an intrinsic semiconductor at 0K?

The carriers are absent in the conduction band of an intrinsic semiconductor at 0 K. Therefore, the conductivity is zero and hence resistivity is infinity. Thus the resistance is infinite (much large) of an intrinsic semiconductor at 0 K.


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4

In semiconductors, thermal collisions are responsible for taking a valence electron to the conduction band. Why does the number of conduction electrons not go on increasing with time as thermal collisions continuously take place?

5

When an electron goes from the valence band to the conduction band in silicon, its energy is increased by 1.1 eV. The average energy exchanged in a thermal collision is of the order of kT which is only 0.026 eV at room temperature. How is a thermal collision able to take some of the electrons from the valence band to the conduction band?

7

We have valence electrons and conduction electrons in a semiconductor. Do we also have ‘valence holes’ and ‘conduction holes’?

8

When a p-type impurity is doped in a semiconductor, a large number of holes are created. This does not make the semiconductor charged. But when holes diffuse from the p-side to the n-side in a p-n junction, the n-side gets positively charged. Explain.

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45. Semiconductors and Semiconductor Devices
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