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
What happens when a forward bias is applied to a p-n junction?
Why is a zener diode considered as a special purpose semiconductor diode?
In semiconductor physics, what is meant by:
(i) rectifier
(ii) an amplifier
(iii) an oscillator
Answer the following question.
Why photodiodes are required to operate in reverse bias? Explain.
Diffusion in a p-n junction is due to ______.
Of the diodes shown in the following diagrams, which one is reverse biased?
A – pn junction has a depletion layer of thickness .of the order of
Depletion layer in p - n junction diode consists of
The nature of binding for a crystal with alternate and evenly spaced positive and negatively ions is
In forward bias width of potential barrier in a p + n junction diode
On increasing the reverse biases voltage to a large value in a P – N junction diode-current
In Figure, Vo is the potential barrier across a p-n junction, when no battery is connected across the junction ______.
A semiconductor device is connected in series with a battery, an ammeter and a resistor. A current flows in the circuit. If. the polarity of the battery is reversed, the current in the circuit almost becomes zero. The device is a/an ______.
An ideal PN junction diode offers ______.
Choose the correct circuit which can achieve the bridge balance.
What is the approximate cut-in voltage of a silicon diode?
What happens to reverse current at the breakdown voltage?
How does effective resistance compare between forward bias after the cut-in voltage and reverse bias before breakdown?
Which expression applies Ohm's law to reverse-biased resistance?
