Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech CSE/IT (Computer Science And Engineering/ Information Technology) 2020 March 2nd Sem BTPH 104 18 Semi Conductor Physics Previous Question Paper
Roll No. Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (CSE/IT) (2018 & Onwards)/(CE)/(ME) (Sem.?1,2)
SEMI-CONDUCTOR PHYSICS
Subject Code : BTPH-104-18
M.Code : 75360
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION - B & C. have FOUR questions each.
3. Attempt any FIVE questions from SECTION B & C carrying EIGHT marks each.
4. Select atleast TWO questions from SECTION - B & C.
SECTION-A
Write briefly :
1. What are the basic assumptions of free electron gas model?
2. What is the origin of the energy gap?
3. What do you mean by occupation probability?
4. What is the basic difference between metal and semiconductor?
5. What do you mean by optoelectronic devices?
6. What do you mean by spatial coherence?
7. Write a short note on Photovoltaic effect.
8. What do you mean by density of states for phonons?
9. What do you understand by resistivity?
10. Write a short note on divergence.
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1 | M-75360 (S1)-1872
Roll No. Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (CSE/IT) (2018 & Onwards)/(CE)/(ME) (Sem.?1,2)
SEMI-CONDUCTOR PHYSICS
Subject Code : BTPH-104-18
M.Code : 75360
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION - B & C. have FOUR questions each.
3. Attempt any FIVE questions from SECTION B & C carrying EIGHT marks each.
4. Select atleast TWO questions from SECTION - B & C.
SECTION-A
Write briefly :
1. What are the basic assumptions of free electron gas model?
2. What is the origin of the energy gap?
3. What do you mean by occupation probability?
4. What is the basic difference between metal and semiconductor?
5. What do you mean by optoelectronic devices?
6. What do you mean by spatial coherence?
7. Write a short note on Photovoltaic effect.
8. What do you mean by density of states for phonons?
9. What do you understand by resistivity?
10. Write a short note on divergence.
2 | M-75360 (S1)-1872
SECTION-B
11. What do you mean by Fermi energy? Obtain an expression for the Fermi energy of a free
electron gas in three dimensions.
12. Explain the periodicity character of the potential in crystals. State and prove Bloch
theorem in this reference.
13. What is the difference between intrinsic and extrinsic semiconductors? Discuss in detail
the dependence of Fermi level on carrier concentration and temperature.
14. a) What do you mean by metal-semiconductor junction? Discuss in detail Schottky
metal-semiconductor junction.
b) Explain the mechanism of diffusion and drift in detail.
SECTION-C
15. a) Discuss stimulated emission, absorption, and spontaneous emission in detail.
b) Derive the Einstein coefficients describing the probabilities of stimulated absorption
and stimulated emission.
16. a) What is population inversion? How is it achieved?
b) Write a note on Fermi?s golden rule.
17. a) Discuss van der Pauw method for resistivity measurement in detail.
b) Discuss Hot-point probe measurement method.
18. a) Write a note on capacitance-voltage measurements.
b) How can we extract different parameters from I-V characteristics of diode?
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 21 March 2020