B.TECH - Semester 8 nanoelectronics Question Paper 2019 (nov)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- 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}, \...
- Show that the density of states in a one dimensional semiconductor is directly proportional to $\sqrt{E}$.
- What is quantum hall effect? What are its applications?
- 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 :
- What is Epitaxy? With the help of a diagram explain Molecular Beam Epitaxy and list its advantages and disadvantages.
- 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.
- What is resonant tunneling effect? Explain the principle of RTD, and show its I-V characteristics.
- 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.