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The potential barrier, in the depletion ...

The potential barrier, in the depletion layer , is due to

A

Electrons

B

Holes

C

Ions

D

Forbidden Band

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The correct Answer is:
C
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In p-n junction diode, near junction holes combine with electrons, and impurity ions form a barrier potential which opposes the recombination of electron-hole pairs. Value of barriers potential for Si is 0.7 volt and for Ge is 0.3 V. thus charge density at the junction becomes zero and an electric field is produced near junction. this region is called depletion layer. Thickness of depletion layer is of the order of 10^(-6) meter. in forward bias p terminal is connected with the positive terminal of cell and n is connected with negative terminal of cell and n is connected with negative terminal of cell. as forward voltage is increased, current increases exponentially. As forward voltage is increased barrier potential in p-n junction diode is A. increased B. Decreased C. remain same D. nothing can be said.

The cause of the potential barrier in a p-n diode is:

AAKASH SERIES-SEMICONDUCTOR DEVICES-EXERCISE -I (ENERGY BANDS AND CLASSIFICATION OF SOLIDS )
  1. Diffusion current in a p-n junction is greater than the drift current ...

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  2. In an intrinsic semiconductor, the fermi energy level lies

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  3. Which of the following statements is not true?

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  4. The mobility of free electron is greater than that of free holes becau...

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  5. Pick out the incorrect statement

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  6. The value indicated by fermi-energy level in an intrinsic semiconducto...

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  7. Pure semiconductor is known as

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  8. A doped semiconductor is

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  9. The potential barrier, in the depletion layer , is due to

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  10. A hole is

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  11. The donor impurity to be added for doping germanium crystal, will be o...

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  12. A P-type semiconductor can be formed by doping Si or Ge with

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  13. An-type and P-type silicon can be obtained by doping pure silicon with

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  14. An-type and P-type silicon can be obtained by doping pure silicon with

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  15. At room temperature, a p-type semiconductor has

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  16. In an n-type semiconductor, the fermi energy level lies

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  17. The band diagrams of three semiconductors are given in the figure. Fro...

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  18. The element that can be used as an acceptor impurity to doped silicon ...

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  19. In extrinsic semiconductors

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  20. In an intrinsic semiconductor at room temperature, number of electrons...

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