p-n junction Consider a silicon p-n junction diode and a 1000-ohm resistor conne

Question

p-n junction

Consider a silicon p-n junction diode and a 1000-ohm resistor connected in series with an AC power supply as shown in the diagram in Fig. 1. Fig. 1 Circuit for producing a display of the current-voltage characteristic for a semiconductor diode on the screen of an oscilloscope as illustrated in Fig. 2. Fig. 2 The oscilloscope screen display obtained for a 1N4004 silicon diode using the circuit in Fig. 1. Although the trace on the screen looks like a plot of current vs. voltage for a diode, what is actually displayed on the screen is a voltage us. voltage plot. (a) Assume that the 1N4007 silicon diode obeys the ideal diode equation: I = I_S [e^qV/kT - 1]. Use the information in Figures 1 and 2 and the ideal diode equation to determine the reverse saturation current I_s for the 1N4007 diode when it was in the circuit of Fig. 1 to produce the oscilloscope trace illustrated in Fig. 2. (Assume T = 300 K, for which kT/q = 0.0259 volts.)

Explanation / Answer

given

I=0.70/1000=7*10^(-4)

V=0.7-0.65=0.05 volts

kT/q=0.0259 volts

we get

7*10^(-4)=Is(e^(kT/q)-1)

Is=1.2*10^(-7) A

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