How to simulate pn junction diode pc1d
Knowledge of these phenomenons is very important to understand other topics like VI characteristics of PN Junction (discussed in PN junction diode article, link given above) and different types of diodes and their applications. Diffusion, Depletion, and Drift in PN JunctionĪt the time of PN junction formation, we observe different phenomena that occur like the movement of the majority and minority carriers, region formation, etc. This technique is called Fabrication of PN junction which results in the formation of the junction. Hence making p-type and n-type semiconductors on the same wafer. antimony, phosphorus, etc to form an n-type region on the same wafer. Then we dope this same p-type semiconductor with a pentavalent impurity i.e. For the formation of the p-n junction, we first convert a silicon wafer to a p-type semiconductor by doping it with a trivalent impurity i.e. We usually make PN junction using a single wafer of Pure Silicon or Germanium. For the ease of understanding, we are explaining it in a simpler way by taking an example. Generally, there are several different ways to make a p-n junction. The most common semiconductors we are using for the formation of PN junction are Germanium and silicon because of its electrical properties. conductors have high electrical conductivity and insulators have low electrical conductivity. According to the Energy Band theory (explained in Semiconductor guide), the conductivity of semiconductors lies between conductors and insulators i.e. insulator, conductor, semiconductor, etc depending upon their electrical conductivity. P-n junction formation/ Fabrication of PN JunctionĪs we know the elements around us are classified into three categories i.e. And we can use a single junction for negative and positive both types of voltage supply.
This results in the formation of the depletion layer and different regions (explained below).ĭue to which some properties like resistance, breakdown temperature, breakdown voltage and characteristics, etc get changed and diode exhibits differently according to the biasing of PN Junction Diode.
The electrons and holes get attracted and repelled towards the center according to the power source connection. fabricated the product shows different behavior. So we can say they work in a particular condition only.īut when these semiconductors are joined chemically i.e. Similarly, an n-type semiconductor works when connected to the negative terminal of the circuit because it has electrons as majority carriers and holes as minority carriers. Extra Marks: PN Junction was discovered by the American physicist Russell Ohl at Bell laboratories.Īs we have read in our article on semiconductor (link given above), in p-type semiconductor holes are majority carriers and electrons are minority carriers and these works only when it is connected to the positive terminal of the circuit.