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प्रश्न
Explain the formation of the barrier potential in a p-n junction.
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उत्तर
A p-n junction is formed by bringing p-type and n-type semiconductors together in very close proximity.
At the instant of p-n-junction, movement of free electrons from the n-side and free holes from the p-side diffuse across the junction and combine and thus leave -ve ions on the p-side and +ve ions inn-side.
These two layers of +ve and -ve ions form the depletion region and the potential difference thus sets up is called the potential barrier.
संबंधित प्रश्न
(i) Explain with the help of a diagram the formation of depletion region and barrier potential in a pn junction.
With reference to semiconductor devices, define a p-type semiconductor and a Zener diode.
What is the use of Zener diode?
Plot a graph showing variation of current versus voltage for the material GaAs ?
Show on a graph, the variation of resistivity with temperature for a typical semiconductor.
With reference to semi-conductors answer the following :
(i) What is the change in the resistance of the semi-conductor with increase in temperature ?
(ii) Name the majority charge carriers in n-type semi-conductor.
(iii) What is meant by doping ?
Basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc are ______.
Figure shows the transfer characteristics of a base biased CE transistor. Which of the following statements are true?
At Vi = 0.4 V, transistor is in active state.
At Vi = 1 V, it can be used as an amplifier.
At Vi = 0.5 V, it can be used as a switch turned off.
At Vi = 2.5 V, it can be used as a switch turned on.
 (a) |
 (b) |
- Name the type of a diode whose characteristics are shown in figure (A) and figure (B).
- What does the point P in figure (A) represent?
- What does the points P and Q in figure (B) represent?
Answer the following giving reasons:
A p-n junction diode is damaged by a strong current.
