B.TECH - Semester 7 nanoelectronics Question Paper 2020 (sep)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- For a tunnel junction having $\mathrm{C}=0.5 \mathrm{~F}$ and $\mathrm{R}_{\mathrm{t}}=100 \mathrm{~K} \Omega$. What is the maximum temperature at which you would expect to find Coulomb blockade?
- (a) Explain the various limitations of microelectronics. 10
- (b) Explain the basic properties of two dimensional semiconductor nanostructures with neat diagrams. 10
- (a) Differentiate between quantum wells, wires and quantum dots using suitable equations.
- (b) Explain the diagrams of parabolic and triangular potential wells using suitable equations.
- (a) Explain the MBE process using suitable diagrams and also list out the advantages and disadvantages.
- (b) What is meant by UV-Visible spectroscopy?
- (a) Compare SEM, TEM and AFM. 10
- (b) Explain any two physical vapour deposition processes.
- (a) Explain the Shubnikov-de Hass effect of magnetic fields and AharonovBohm effect?
- (b) Explain modulation doped quantum wells with neat diagrams.
- (a) Explain the different scattering mechanisms involved in parallel transport. 10
- (b) What are heterojunctions? Explain the well formation in MOSFET structures.
- (a) Explain the working of quantum well semiconductor laser. Mention their advantages over double heterojunction lasers.
- (b) Briefly explain :
- (i) Quantum dot LED (ii) NEMS.
- (a) Explain the working of Heterojunction Bipolar Transistors (HBT).
- (b) What are MODFETs? Why they are having higher electron mobility than MOSFETs?
- What are the typical characteristic lengths used in mesoscopic systems?
- Explain briefly how the density of states and dimensionality are related for various low dimensional structures.
- What is meant by quantum mechanical coherence?
- Write short notes on fabrication of nanoparticles using the method of grinding with iron balls.
- List out the advantages and disadvantages of ion implantation process?
- What is the basic principle behind AFM?
- What are the different scattering mechanism in parallel transport?
- What are superlattices?
- What is meant by resonant tunnel effect?