Advertisements
Advertisements
Question
In the depletion region of a diode ______.
- there are no mobile charges.
- equal number of holes and electrons exist, making the region neutral.
- recombination of holes and electrons has taken place.
- immobile charged ions exist.
Options
a and b
a, b and d
c and d
a, b, c and d
Advertisements
Solution
a, b, c and d
Explanation:
On account of the difference in concentration of charge carrier in the two sections of the P-N junction, the electrons from N-region diffuse through the junction into P-region and the hole from P-region diffuse into N-region.
Due to diffusion, the neutrality of both N and P-type semiconductor is disturbed, a layer of negatively charged ions appear near the junction in the P-crystal and a layer of positive ions appears near the junction in N-crystal. This layer is called the depletion layer.
The thickness of the depletion layer is 1 micron = 10-6 m.
Width of depletion layer ∞ 1/Dopping
Depletion is directly proportional to temperature.
Important point: The P-N junction diode is equivalent to the capacitor in which the depletion layer acts as a dielectric.
APPEARS IN
RELATED QUESTIONS
In the following diagram, is the junction diode forward biased or reverse biased ?
What is the use of Zener diode?
The graph shown in the figure represents a plot of current versus voltage for a given semiconductor. Identify the region, if any, over which the semiconductor has a negative resistance.
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 ?
The plate current in a diode is 20 mA when the plate voltage is 50 V or 60 V. What will be the current if the plate voltage is 70 V?
With reference to a semiconductor diode, what is meant by:
(i) Forward bias
(ii) Reverse bias
(iii) Depletion region
Answer the following question.
Why photodiodes are required to operate in reverse bias? Explain.
Basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc are ______.
Depletion layer in p - n junction diode consists of
When we apply reverse biased to a junction diode, it
The expected energy of the electron at absolute zero is called:-
In the circuit shown in figure, if the diode forward voltage drop is 0.3 V, the voltage difference between A and B is ______.
Consider an npn transistor with its base-emitter junction forward biased and collector base junction reverse biased. Which of the following statements are true?
- Electrons crossover from emitter to collector.
- Holes move from base to collector.
- Electrons move from emitter to base.
- Electrons from emitter move out of base without going to the collector.
A Zener of power rating 1 W is to be used as a voltage regulator. If zener has a breakdown of 5 V and it has to regulate voltage which fluctuated between 3 V and 7 V, what should be the value of Rs for safe operation (Figure)?
In the circuit shown in figure, when the input voltage of the base resistance is 10 V, Vbe is zero and Vce is also zero. Find the values of Ib, Ic and β.
Answer the following giving reasons:
A p-n junction diode is damaged by a strong current.
With reference to a semiconductor diode, define the depletion region.
With reference to a semiconductor diode, define the potential barrier.
What is meant by forward biasing of a semiconductor diode?
Choose the correct circuit which can achieve the bridge balance.
