(a) Differentiate between intrinsic and extrinsic semiconductors. Des…
Previous year question for Applied Engineering Physics.
Question
(a) Differentiate between intrinsic and extrinsic semiconductors. Describe n-type and p-type semiconductors. Derive an expression for the electron concentration in an intrinsic semi conductor. (12)
(b) An n-type germanium sample is $2\text{ mm}$ wide and $0.2\text{ mm}$ thick. A current of $10\text{ mA}$ is passed through the sample (x-direction) and a field of $0.1\text{ Wb/m}^2$ is directed perpendicular to the current flow (Z-direction). The developed Hall voltage is $1.0\text{ mV}$. Calculate the Hall co-efficient and number of electrons/$\text{m}^3$. (8)
- Year: 2018
- Subject: Applied Engineering Physics