Question: Q. 1. Write two points of difference between intrinsic and extrinsic semiconductors.
[Foreign 2017]
OR
Distinguish between ‘intrinsic’ and ’extrinsic’ semiconductors.
[Delhi I, II, III 2015]
Show Answer
Solution:
Ans. Any two differences
$1+1$
| Intrinsic | Extrinsic |
|---|---|
| (i) Pure semiconductor. | (i) Doped or impure. |
| (ii) $n_{e}=n_{h}$. | (ii) $n_{e} \neq n_{h}$. |
| (iii) Low conductivity at room temperature. |
(iii) Higher conduc- tivity at room tem- perature. |
| (iv) Conductivity de- pends on temperature. |
(iv) does not depend ity dignificantly on tem- perature. |
[CBSE Marking Scheme 2017]
