DOKUZ EYLUL UNIVERSITY
FACULTY OF ENGINEERING
ELECTRICAL AND ELECTRONICS ENGINEERING
EED 2309 SEMICONDUCTOR DEVICES
LABORATORY 1 REPORT
STUDENT GROUP: A1 - 3
STUDENT NAME: Utkucan SÖZEYATAROĞLU
STUDENT ID: 2021502052
STUDENT NAME: Mert ALTAY
STUDENT ID: 2021502086
TEACHER NAME: Abdullah BOZTEKIN
OCTOBER 21, 2023
1.THEORY
At this section, theoretical results of the laboratory procedure and purpose of diode on the circuit takes
place.
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Diodes are the semiconductors, that can allow electrical current to flow in one direction.
Beside the Si diodes has the similar properties, they are supply power. Si diodes has a low
forward voltage.
IDEAL DIODE :
Si DIODE:
The V-I characteristic of a silicon diode is shown in the figure.
Since it is short circuit its procedure
Vps + Vd + VR = 0 (Kirchoff’s voltage law)
Vps + VD1 – VD2 = 0 (Kiechoff’s voltage law)
-Vps + VR + VD = 0 (Kirchoff’s voltage law)
I1 = ID1 + ID2 (Kirchoff's current law)
2.APPLICATIONS AND RESULTS
The digital multimeter was set to measure resistance and showed 0 when the two probes were touched
together. DMM is set to measure resistance and current respectively and measurement values are taken.
Figure 1
Propes of the DMM connected to propes of the diodes with parallel connection.
For E = 0,5 V
VD = 0,467 V
For E = 1 V
VD = 0,522 V
Propes of the DMM connected to propes of the resistance with parallel connection.
For E = 0,5 V
VR = 0,104 V
For E = 1 V
VR = 0,522 V
Digital multimeter is set to measure current.
Propes of the DMM connected to power supply and prope of the diode with serial connection.
For E = 0,5 V
ID = 0,09 mA
For E = 1 V
ID = 0,43 Ma
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For E = 0,5 V , circuit is a open circuit which mean is current is “0” and the voltage below “0”.
For E = 1 V , circuit is a short circuit which mean is voltage is equal to “0” and the current more
than “0”.
Figure 2
Propes of the DMM connected to propes of the Diode 2 vith parallel connection.
VD2 = 5,783 V
V0 = 0 V
ID = 0,01 mA
In this circuit, diode2 is reverse-biased. Therefore, it can be modelled as an open circuit. The reason for
this is that the second diode is connected in the opposite direction to the current passing through the
circuit, acting as an open switch and causing no current to flow through the circuit.
Figure 3
Propes of the DMM connected to power supply and “+” prope with serial connection.
I1 = 28,9 mA
ID1 = 14,33 mA
ID2 = 14,17 mA
V = 0,67 V
At the figure 3, connecting the two diodes in the same direction as the current passing through the
circuit therefore acts as a closed switch and ensures that the current passing through the circuit is
completed, that is why the circuit is forward-bias which mean is short circuit.
CONCLUSION
In this experiment, we obsered the effects of the diodes in these cicuits. Flow of the current is
one of these effects. In the figure 1, for 0,5V power supply cicuit is open circuit because “E”
must be min 0,7V, for Si diodes. Fort he 1V power supply, since it is short cicuit, current flows. In
the figure 3, since diode does not connect correct, circuit is reverse bias. For these reasin,
current equal to zero. In the figure 2.4, we obtain what happen if the diodes connected parallel
each other. We observed, how to voltage and current values change when the diodes connected
forward, reverse and parallel.