Question

The temperature $(T)$ dependence of resistivity $(r)$ of a semiconductor is represented by

• A.
• B.
• C.
• D.

Answer 1

Answer: (C)

The variation of specific resistance with temperature is given by
$\rho ={\rho }_0\left[1+\alpha \left(T-T_0\right)\right]$
where $\rho =$ specific resistance at temperature $T$
${\rho }_{ref}=$ specific resistance of reference temperature
$\alpha =$ temperature coefficient of resistance which is negative for semiconductor.
$\rho ={\rho }_0-{\rho }_0\alpha \left(T-T_0\right)$
Comaring with straight line equation, $y=mx+c$
$\Rightarrow m$, slope is negative.