A. Define the drift current in a semiconductor and give the mathematical expressions about both the current density of the electron drift current and the current density of the hole drift current. Define the diffusion current in a semiconductor and give

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A. Define the drift current in a semiconductor and give the mathematical
expressions about both the current density of the electron drift current and the current
density of the hole drift current. Define the diffusion current in a semiconductor and give
the mathematical expressions about both the current density of the hole diffusion current
and the current density of the electron diffusion current.
B. P-N junction is given. Please:
i) Draw the cross-section of this p-n junction and show the depletion region
and the corresponding electrical field for an applied external voltage V # 0 volts if the
positive terminal of the voltage source is connected to the n-side of the p-n junction and
the negative terminal of the voltage source is connected to the p-side of this p-n junction.
ii) Draw the cross-section of this p-n junction and show the depletion region
and the corresponding electrical field for an applied external voltage V # 0 volts if the
negative terminal of the voltage source is connected to the n-side of the p-n junction and
the positive terminal of the voltage source is connected to the p-side of this p-n junction.
Give the condition that the depletion region to disappear.
C. Draw a n-p-n transistor connected in circuit common base (CB).
Draw the input current-voltage characteristic, the output current-voltage characteristics
and the graph giving dependence of the output current as function of the input current.
Define the amplification gain of this circuit.
Transcribed Image Text:A. Define the drift current in a semiconductor and give the mathematical expressions about both the current density of the electron drift current and the current density of the hole drift current. Define the diffusion current in a semiconductor and give the mathematical expressions about both the current density of the hole diffusion current and the current density of the electron diffusion current. B. P-N junction is given. Please: i) Draw the cross-section of this p-n junction and show the depletion region and the corresponding electrical field for an applied external voltage V # 0 volts if the positive terminal of the voltage source is connected to the n-side of the p-n junction and the negative terminal of the voltage source is connected to the p-side of this p-n junction. ii) Draw the cross-section of this p-n junction and show the depletion region and the corresponding electrical field for an applied external voltage V # 0 volts if the negative terminal of the voltage source is connected to the n-side of the p-n junction and the positive terminal of the voltage source is connected to the p-side of this p-n junction. Give the condition that the depletion region to disappear. C. Draw a n-p-n transistor connected in circuit common base (CB). Draw the input current-voltage characteristic, the output current-voltage characteristics and the graph giving dependence of the output current as function of the input current. Define the amplification gain of this circuit.
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