The width of the depletion region decreases with increased forward biased. The forward current will starts flowing from anode to cathode. connection of P-type with the positive terminal and N-type with negative terminal. Now moving towards biased mode, when biasing is applied, i.e. It will create an internal electric field. The region so formed is called depletion layer. Due to this the movement of further majority carriers will get restricted. This stage is called saturation stage.Īfter this, the electrons and holes which have reached the junction will recombine. A stage will reach when no more charge carriers will diffuse across the junction. In an unbiased mode, the electrons from N-region and holes from P-region will move towards the junction due to the concentration gradient. Now, the behaviour of PN junction will be different in unbiased mode and biased mode. The P-type semiconductor has holes as majority carriers while N-type semiconductor has electrons as majority carriers. The depletion layer is formed due to different concentration of charge carriers in both the region. The junction formed by joining these two semiconductors is termed as PN junction. It can be considered as a switch or an amplifier.Ī diode is formed by combining two semiconductor specimens of which one is P-type semiconductor and other is an N-type semiconductor. anode and cathode.ģ terminals are there in transistor i.e. Two Junctions are formed one in between emiter and base and other between base and collector.Ģ terminals are there in a diode i.e. Only one junction between P-type and N-type semiconductor. It is formed by sandwiching a layer of P-type or N-type material between two N-type or P-type material on either end. It is formed by joining a P-type semiconductor with N-type semiconductor. Transistor is a three terminal device which allows current to flow from high resistance region to low resistance region We will discuss all these factors with the help of comparison chart.Ī diode is a two terminal device which allows current to pass in one direction only. There are certain factors which differentiate these two devices such as depletion region, applications etc.
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