B.TECH - Semester 8 nanoelectronics Question Paper 2019 (nov)
Practice authentic previous year university questions for better exam preparation.
- What is resonant tunneling effect? Explain the principle of RTD, and show its I-V characteristics.
- What is quantum hall effect? What are its applications?
- What is Epitaxy? With the help of a diagram explain Molecular Beam Epitaxy and list its advantages and disadvantages.
- Discuss the sol gel process used in the production of $\mathrm{SiO}_{2}$.
- Explain the process of three-dimensional island formation by self-assembly.
- With the help of a diagram show how STM can be used for characterization of nano materials.
- Calculate the screening length of carriers in Si semiconductor for the following parameters. $\varepsilon \mathrm{r}=11.9 \quad \varepsilon_{0}=8.854 \times 10^{-12} \mathrm{~F} / \mathrm{m} \mathrm{k}=1.38 \times 10^{-23} \mathrm{~J} / \mathrm{K}, \quad T=300 \mathrm{~K}$ Electronic charge $=1.6 \t...
- Show that the density of states in a one dimensional semiconductor is directly proportional to $\sqrt{E}$.
- What is quantum conductance? Discuss the Landauer formula for quantum transport.
- What is quantum confined stark effect with reference to quantum welt optical modulator?
- Discuss the principle of CNT devices and its different types.
- Write a note on nano electro mechanical systems. What are its applications? Answer any two questions from each module. Each question carries 10 marks :
- Discuss the PECVD process of chemical vapor deposition method with the help of a neat diagram.
- With the help of a diagram briefly explain Ion implantation. Explain the following terms (a) Implantation damage (b) Annealing (c) Channeling. $$ 4+3+3 $$
- For quantum wires and quantum dots determine the electron wave functions and show how it is quantized. Find their DOS as a function of energy.
- Discuss in detail the four different types of electron scattering mechanisms in parallel transport.
- Explain Aharonov-Bohm effect and Shubnikov-de lass effect in detail.
- Discuss the following in detail (a) Coulomb blockage and principle of single electron transistor (b) Principle of Quantum dot LED with the help of necessary diagrams.
- With the help of band diagrams compare homo junction and hetero junction bipolar transistors and discuss various advantages of hetero junction transistors over homo junction transistors.
Browse Previous Year Question Papers →