Part B - 16 Marks Questions

PART B (16 Marks Questions)

Anna University Questions:

Intrinsic semiconductor

1. Obtain an expression for intrinsic carrier concentration in an intrinsic semiconductor. (AU May 2014)

2. Derive an expression for the density of holes in an intrinsic semiconductor. (AU July, Dec. 2015)

3. Derive an expression for concentration of holes (absence of electrons) in intrinsic semiconductors. (AU Nov/Dec 2013)

4. Obtain an expression for the carrier concentration of electrons in an intrinsic semiconductor. (AU May/June 2014)

5. Assuming the Fermi - Dirac distribution derive an expression for the concentration of electrons per unit volume in the conduction band of an intrinsic semiconductor. (AU April/May 2014; Nov/Dec 2015)

Extrinsic semiconductors

6. Derive the relation for carrier concentration in N-type eto semiconductor. bas (AU Dec 2014)

7. Obtain an expression for density of electrons in the conduction band of an n- type and density of holes in the valence band of a p-type extrinsic semiconductor. AU Dec 2015)

8. Obtain an expression for the density of electrons in the conduction band of an n- type semiconductors and show that it is proportional to the square root of the donor concentration at low temperatures. Also state what happens at high temperatures. (AU Nov/Dec 2013)

9. Obtain an expression for the density of holes in the valence band of p type semiconductors and show that it is rodo proportional to the square root of the acceptor concentration Barn at low temperatures.  (AU April/May 2012)

Hall effect.

10. (i) Give the theory of

(ii) Using that effect how will you determine the electrical conductivity of a semiconductor. (AU Oct 2014)

11. (i) What is Hall effect? Derive an expression of Hall coefficient.

(ii) Describe an experimental set-up for the measurement of the Hall voltage and give its applications. (AU July 2015)

12. (i) What is Hall effect? Show that for a p- type semiconductor the Hall coefficient R_H is given by 1/pe.

(ii) Mention the applications of Hall effect. (AU Dec 2016)

13. What is Hall effect? Give the theory of Hall effect. Describe the Hall effect experiment to determine the Hall coefficient of semiconductor. (AU Dec 2013)

14. (i) Obtain expression for Hall coefficient. brood) of

(ii) How will you measure 'Hall coefficient experimentally?

(iii) Describe any two applications of Hall effect (AU May 2014)

15. (i) Explain Hall effect in p-type and n-type semiconductors.

(ii) Derive an expression for Hall coefficient.  

(iii) Describe the experimental setup for the measurement of Hall coefficient. (AU, Dec 2016)

16. What is Hall effect? Derive an expression for Hall coefficient. Describe an experiment for the measurement of Wods on the Hall coefficient and mention its applications. (AU, May/June 2016)

17. (i) Explain the phenomenon of Hall effect.

(ii) Derive an expression for Hall coefficient for a n type semiconductor and for p type semiconductor. Also state how Hall voltage is related. (AU, May/June 2014)