Download PTU M.Tech. ECE 2nd Semester 76265 NANO ELECTRONICS Question Paper

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Total No. of Pages : 02

Total No. of Questions : 8

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M.Tech. (ECE) (2018 Batch) (Sem.-2)

NANO ELECTRONICS

Subject Code : MTEC-PE4A-18

M.Code : 76265

Time: 3 Hrs.

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Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWELVE marks.

1. 1. Explain the phenomenon of formation of energy- bands.

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   2. Explain top down and bottom up approaches.
   3. How energy discreetness occur in nano materials?
2. When a semiconductor material can be treated as a bulk, quantum well, quantum wire, quantum dot or nano- particle? Discuss in terms of density of states, electronic properties, optical properties. energy level structures.
3. 1. Define any two characteristic lengths associated with nano-electronic devices.

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   2. Draw the energy vs. wave vector diagram for a parabolic quantum well and list the features.
   3. MODFETs are High Electron Mobility Transistors. Justify.
   4. List the merits of AFM over STM.
4. 1. Derive the expression for density of states function of a 2D semiconductor nano structure.

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   2. Compare and contrast the features of square, triangular and parabolic quantum wells.
5. 1. DC sputtering cannot be used for the coating of non-conducting materials. Justify.
   2. Illustrate the working principle of Atomic Force Microscope.

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6. Explain the principle, construction and working of :
   1. Scanning electron microscopy
   2. Infrared and Raman spectroscopy
7. Explain photoemission process and X-RD spectroscopy in detail. Also, discuss its limitations.
8. 1. Explain quantum interference transistor.

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   2. Explain basic operation of DNA and DNA computer.

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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