Unformatted text preview: voltage . At what forward voltage do the bands become flat? Plot the band diagram at V = 1 Volt, and explain the shape of the bands. II) For a long diode, the excess carrier concentration are given by equations (531a) and (531b) Use the ‘PN Junction Long Base Depletion Approximation’ and plot the peak of excess electron and hole concentration vs. V app . At what voltage do you begin to see highlevel injection? III) Theoretical Exercise: a. Explain qualitatively how a forward bias across a pn junction reduces the width of the depletion region. b. For the pn junction considered in this problem, deep in the pregion is the current carried exclusively by electrons or holes? For such case, is the current dominated by drift, diffusion, or both? Justify your answer....
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 Spring '08
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 Pn junction, pn junction, pn junction tools

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