Study forward characterister of p-n junction diode

Objective:

To verify forward characteristics of p-n junction diode.

Theory:

A p-n junction diode is of the simplest semiconductor devices around, and which has the characteristics of passing current in one direction only. However, unlike a resistor, a diode does not behave linearly with respect to the applied voltage as the diode has an exponential current-voltage (I-V) relationship. If a suitable positive voltage (forward bias) is applied between the two end of the p-n junction, it can supply free electrons and holes with the extra energy the require to cross the junction as the width of the depletion layer around the p-n junction is decreased. This results in a characteristics curve of zero current flowing up to this voltage point, called the “knee” on the static curves and high current through diode.

Apparatus Table:

SL.NO     NAME OF APPARATUS USEDQUANTITY      MAKER’S NAMERANGE
1DC ammeter
2DC voltmeter
3Power supply
4Resistance
5P-N junction diode
6Bread-board
7Connecting wires

Observartion Table:   

SL.NOSUPPLY VOLTAGE (VS) (Volt)Voltage across diode (VD) (volt)Current through diode (ID) (mA)
1
2
3
4
5
6
7
8

Conclusion:

P-N junction is best suited for rectification of ac in dc supply. We are neglected some instrumentation error.

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