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Chapter 2 P-N Junction Diode Characteris... > 2.11 Volt-Ampere Characteristics of ...

2.11 VOLT –AMPERE CHARACTERISTICS OF P–N DIODE

2.11.1 Forward-biased P–N Diode Working

Figure 2.39 shows the method of forward biasing a diode with forward bias V. But Vf is the actual voltage across the P–N diode that applies the forward bias to the P–N diode, because of the use of the current-limiting resistor RL in the circuit. Forward bias reduces the depletion region width causing for movement of charge carries through the device.

 

P–N semiconductor diode with forward bias Vf

 

Fig. 2.39 P–N semiconductor diode with forward bias Vf

 

From the expression

 

image

 

it can be seen that the diode conduction does not start, till the forward bias voltage Vf reaches a particular value. This can also be seen from the forward characteristic shown in Fig. 2.41.

Semiconductor diode conduction can be explained qualitatively by considering the two types of forces on the majority charge carriers on either P- or N-type semiconductor materials.


  

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