If a Small Voltage is Applied to a P-n Junction Diode, How Will the Barrier Potential Be Affected When It Is(Ii) Reveres Biased? - Physics


If a small voltage is applied to a p-n junction diode, how will the barrier potential be affected when it is(ii) reveres biased?



If a small voltage is applied to a p–n junction diode in the reverse bias, then the barrier potential increases

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2014-2015 (March) Panchkula Set 3


With the help of a neat circuit diagram, explain the working of a photodiode. 

Colour of light emitted by LED depends upon__________________ .

  1. its forward bias
  2. its reverse bias
  3. the band gap of the material of semiconductor
  4. its size

The width of depletion region of p-n junction diode is _______.

(A) 0.5 nm to 1 nm

(B) 5 nm to 10 nm

(C) 50 nm to 500 nm

(D) 500 nm to 1000 nm


State its any ‘two’ uses of photodiode.

How is a photodiode fabricated?

Draw V − I characteristics of a p-n junction diode. Answer the following questions, giving reasons:

(i) Why is the current under reverse bias almost independent of the applied potential up to a critical voltage?

(ii) Why does the reverse current show a sudden increase at the critical voltage?

Name any semiconductor device which operates under the reverse bias in the breakdown region.

Draw the circuit diagram of a full wave rectifier using p-n junction diode.

Explain its working and show the output, input waveforms.

Show the output waveforms (Y) for the following inputs A and B of (i) OR gate (ii) NAND gate ?

Explain the formation of depletion layer and potential barrier in a p−n junction.

An ideal diode should pass a current freely in one direction and should stop it completely in the opposite direction. Which is closer to ideal-vacuum diode or a p-njunction diode?

The plate resistance of a triode is 8 kΩ and the transconductance is 2.5 millimho. (a) If the plate voltage is increased by 48 V and the grid voltage is kept constant, what will be the increase in the plate current? (b) With plate voltage kept constant at this increased value, by how much should the grid voltage be decreased in order to bring the plate current back to its initial value?

Explain how a potential barrier is developed in a p-n junction diode.

Write the important considerations which are to be taken into account while fabricating a p-n junction diode to be used as a Light Emitting Diode (LED). What should be the order of the band gap of an LED, if it is required to emit light in the visible range? Draw a circuit diagram and explain its action.

Answer the following question.
Draw solar cell V-I characteristics.

With reference to Semiconductor Physics,

Name the process that causes depletion region in a p-n junction.

Explain photodiode.

What is the magnitude of the potential barrier across a Ge p-n junction?

Pressure P varies as P = `alpha/beta "exp" (- (alpha x)/"k"_"BT")`, where x denotes the distance, kB is the Boltzmann's constant, T is the absolute temperature and α and β are constant. The dimension of β is ______.

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. lt can detect a signal of wavelength ______.

For LED's to emit light in visible region of electromagnetic light, it should have energy band gap in the range of:

Which one of the following is not the advantage of LED?

Consider the following statements (A) and (B) and identify the correct answer.

  1. A Zener diode is connected in reverse bias when used as a voltage regulator.
  2. The potential barrier of the p-n junction lies between 0.1 V to 0.3 V.

The amplifiers X, Y and Z are connected in series. If the voltage gains of X, Y and Z are 10, 20 and 30, respectively and the input signal is 1 mV peak value, then what is the output signal voltage (peak value)

  1. if dc supply voltage is 10V?
  2. if dc supply voltage is 5V?

Why a photo-diode is operated in reverse bias whereas the current in the forward bias is much larger than that in the reverse bias? Explain. Mention its two uses.

How can a photodiode be used to measure light intensity?

The value of power dissipated across the Zener diode (Vz = 15 V) connected in the circuit as shown in the figure is x × 10–1 watt. The value of x, to the nearest integer, is ______.


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