☑ Pn Junction Diode Bias

This external bias voltage is designated as vbias. In reverse biased p n junction diode the positive terminal of the battery is connected to the n type semiconductor material and the negative terminal of the battery is connected to the p type semiconductor material.

Schottky Diode Or Schottky Barrier Semiconductor Diode

Pn Junction Diode Forward And Reverse Bias Characteristics

2 Typical Current Voltage Bias I V Characteristic Of A

Forward bias is the condition that allows current through the pn junction diode.

Pn junction diode bias. The forward bias and the reverse bias properties of the pn junction imply that it can be used as a diode. In order to reverse bias a pn junction the negative terminal of the battery is connected to the p type and positive terminal is connected to the n type as shown in the figure below. When the current through the junction increases the diffusion capacitance also increases.

If we apply forward bias to the pn junction diode that means the negative terminal is connected to the n type material and the positive terminal is connected to the p type material across the diode which has the effect of decreasing the width of the pn junction diode. The p n junction diode during the reverse bias is highly sensitive to the light so that it can be used in photodiode application. The real characteristics of pn junction diode varies with the applied external potential to the junction that changes the properties of junction diode.

The process by which a p n junction diode blocks the electric current in the presence of applied voltage is called reverse biased p n junction diode. Diffusion capacitance of pn junction it the capacitance of the diode in forward biased condition and it is defined as the ratio of transiting charge created to the differential change in voltage. A pn junction is said to be reverse biased when the external dc voltage applied to the junction is in such a direction that it increases the potential barrier.

A pn junction diode allows electric charges to flow in one direction but not in the opposite direction. The voltage source is connected in such a way that it produces a forward bias. The junction diode acts as short circuit in forward bias and acts as open circuit in reverse bias.

From the analysis of both forward bias and reverse bias we can arrive at one fact a pn junction diode conducts current only in one direction ie during forward bias. Negative charges electrons can easily flow through the junction from n to p but not from p to n and the reverse is true for holes. The resistor limits the forward current to a value that will not damage the diode.

The p n junction diode working under forward bias is very useful for the light emitting diode application. During forward bias the diode conducts current with increase in voltage. If the p n junction diode is forward biased with approximately 07 volts for silicon diode or 03 volts for germanium diode the p n junction diode starts allowing the electric current.