The figure below shows the electron and hole concentration in a silicon region. The electron and hole pilities are 500 and 200 cm²/V*s respectively. The electric field is 0.5 V/cm a) Show the direction of hole and electron drift and the direction of theif drift current (at the right to the figure) b) Show the direction of hole and electron diffusion and the direction of their diffusion current (at the righ to the figure) c) Calculate the drift current density at x=6 (
The figure below shows the electron and hole concentration in a silicon region. The electron and hole pilities are 500 and 200 cm²/V*s respectively. The electric field is 0.5 V/cm a) Show the direction of hole and electron drift and the direction of theif drift current (at the right to the figure) b) Show the direction of hole and electron diffusion and the direction of their diffusion current (at the righ to the figure) c) Calculate the drift current density at x=6 (
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Transcribed Image Text:The figure below shows the electron and hole concentration in a silicon region. The electron and hole
mobilities are 500 and 200 cm?/V*s respectively. The electric field is 0.5 V/cm
a) Show the direction of hole and electron drift and the direction of theif drift current (at the right to the
figure)
b) Show the direction of hole and electron diffusion and the direction of their diffusion current (at the right
to the figure)
c) Calculate the drift current density at x=6 um
d) Calculate the diffusion current density at x=2 um
e) Compare the drift and diffusion current density at x-2 with the similar current values at x=6 (without
calculations). Are they the same or different? Explanation needed for credit.
E
2.0 -107
n(x)
1017 1
1016
p(x)
104
x = 2um
x = 6um
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