A Schottky diode and a pn junction diode have cross$-$sectional areas of A $7104$ cm$2.$ The reverse$-$saturation current densities at T $300$ K of the Schottky diode and pn junction are $4108$ A$/$cm$2$ and $31012$ A$/$cm$2,$ respec tively. A forward$-$bias current of $0\mathrm{.}8$ mA is required in each diode. $($a$)$ Determine the forward$-$bias voltage required across each diode. $($b$)$ If the voltage from part $($a$)$ is maintained across each diode, determine the current in each diode if the temperature is increased to $400$ K$.($Take into account the temperature dependence of the reverse$-$ saturation currents. Assume Eg $1\mathrm{.}12$ eV for the pn junction diode and B$00\mathrm{.}82$ V for the Schottky diode.$)$