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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
EIGHTH SEMESTER B.TECH DEGREE EXAMINATION(S), OCTOBER 2019

Course Code: EC402
Course Name: NANOELECTRONICS

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) Explain sol-gel process and how you can fabricate a quantum wire using the (10)
technique.
b) Explain quantum mechanical coherence. (5)
2 8) Starting from Schrodinger equation, show that the density of states ina 2D nano material (10)

is independent of energy.

b) Explain the precipitation of quantum dots. (5)

3 9) Explain the different types of PVD techniques. (10)

b) Explain any ten properties of graphene. (5)
PART B

Answer any two full questions, each carries 15 marks.

4 a) Define the term Photoluminescence. Discuss with neat diagrams PL spectroscopy (10)

in detail.
b) Compare electron and optical microscope. (5)
5 லு Illustrate the working of SEM .Explain the different specimen interactions. (10)

b) Explain how conductivity is increased in 2D electron gas in AlGaAs-GaAs_ (5)
structure.

6 a) Compare MQW with superlattice structure. (8)

b) Explain modulation doping and why mobility of carrier increases in modulation (7)

doped structure.

PART C
Answer any two full questions, each carries 20 marks.
7 a) Derive Landauer Formula and explain its significance. (9)
b) Explain Landau levels and its variation with magnetic field. (6)
c) Explain perpendicular transport in quantum structure. (5)

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