Forward Bias And Reverse Bias Of Pn Junction Diode Pdf
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This understanding will lay a better foundation for exploring further into different aspects of semiconductor electronics. PN junction is a significant building block and it is one among the indispensable structures offered by the semiconductor technology in electronics. The exciting property of semiconductor diode is facilitating the electrons to flow exclusively in one direction across it; as a result it acts as a rectifier of Alternating Current.
Forward Biased P-N Junction
A p-n junction consists of two semiconductor regions with opposite doping type as shown in Figure 4. The region on the left is p -type with an acceptor density N a , while the region on the right is n -type with a donor density N d. The dopants are assumed to be shallow, so that the electron hole density in the n -type p -type region is approximately equal to the donor acceptor density. We will assume, unless stated otherwise, that the doped regions are uniformly doped and that the transition between the two regions is abrupt. We will refer to this structure as an abrupt p-n junction. Frequently we will deal with p-n junctions in which one side is distinctly higher-doped than the other. We will find that in such a case only the low-doped region needs to be considered, since it primarily determines the device characteristics.
A P-N Junction Diode is formed by doping one side of a piece of silicon with a P-type dopant Boran and the other side with a N-type dopant phosphorus. Ge can be used instead of Silicon. The P-N junction diode is a two-terminal device. This is the basic construction of the P-N junction diode. It is one of the simplest semiconductor devices as it allows current to flow in only one direction. The diode does not behave linearly with respect to the applied voltage, and it has an exponential V-I relationship.
This article provides a more detailed explanation of p—n diode behavior than is found in the articles p—n junction or diode. A p—n diode is a type of semiconductor diode based upon the p—n junction. The diode conducts current in only one direction, and it is made by joining a p -type semiconducting layer to an n -type semiconducting layer. Semiconductor diodes have multiple uses including rectification of alternating current to direct current, detection of radio signals, emitting light and detecting light. The figure shows two of the many possible structures used for p—n semiconductor diodes, both adapted to increase the voltage the devices can withstand in reverse bias. The ideal diode has zero resistance for the forward bias polarity , and infinite resistance conducts zero current for the reverse voltage polarity ; if connected in an alternating current circuit, the semiconductor diode acts as an electrical rectifier.
Bias of PN Junctions
Forward Biased P-N Junction. Forward biasing the p-n junction drives holes to the junction from the p-type material and electrons to the junction from the n-type material. At the junction the electrons and holes combine so that a continuous current can be maintained. Index Semiconductor concepts Semiconductors for electronics. Reverse Biased P-N Junction.
In this chapter you will learn about pn junction electrostatics: Charge density When the diode forward-bias-voltage is increased, the barrier for electron and When the reverse-bias-voltage is increased, the net electric field increases, but.
Characteristics and Working of PN Junction Diode
A diode is an electrical device allowing current to move through it in one direction with far greater ease than in the other. The most common kind of diode in modern circuit design is the semiconductor diode, although other diode technologies exist. Semiconductor diodes are symbolized in schematic diagrams such as the figure below. When placed in a simple battery-lamp circuit, the diode will either allow or prevent current through the lamp, depending on the polarity of the applied voltage.
At thermal equilibrium there are no external inputs such as light or applied voltage. The currents balance each other out so there is no net current within the device. Under steady state there are external inputs such as light or applied voltage, but the conditions do not change with time.
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