Question

A Schottky diode and a pn junction diode have cross-sectional areas of $A=7 \times 10^{-4} \mathrm{~cm}^{2}$. The reverse-saturation current densities at $T=300 \mathrm{~K}$ of the Schottky diode and pn junction are $4 \times 10^{-8} \mathrm{~A} / \mathrm{cm}^{2}$ and $3 \times 10^{-12} \mathrm{~A} / \mathrm{cm}^{2}$, respectively. A forward-bias current of $0.8 \mathrm{~mA}$ 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 $400 \mathrm{~K}$. (Take into account the temperature dependence of the reversesaturation currents. Assume $E_{g}=1.12 \mathrm{eV}$ for the pn junction diode and $\phi_{B 0}=0.82 \mathrm{~V}$ for the Schottky diode.)

          A Schottky diode and a pn junction diode have cross-sectional areas of $A=7 \times 10^{-4} \mathrm{~cm}^{2}$. The reverse-saturation current densities at $T=300 \mathrm{~K}$ of the Schottky diode and pn junction are $4 \times 10^{-8} \mathrm{~A} / \mathrm{cm}^{2}$ and $3 \times 10^{-12} \mathrm{~A} / \mathrm{cm}^{2}$, respectively. A forward-bias current of $0.8 \mathrm{~mA}$ 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 $400 \mathrm{~K}$. (Take into account the temperature dependence of the reversesaturation currents. Assume $E_{g}=1.12 \mathrm{eV}$ for the pn junction diode and $\phi_{B 0}=0.82 \mathrm{~V}$ for the Schottky diode.)

Added by Larry G.

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