![]() In the reverse p-n junction there are free electrons from the anode which is called the negative terminal. In this, the cathode terminal becomes a positive. The anode becomes a negative side when the diode is reverse biassed (i.e p-type is linked to the negative terminal and n-type connected to the positive point). What happens in a reverse-biassed semiconductor diode? The positive charge carriers (holes) begin their flow at the anode terminal, pass through the diode, and finally end up at the cathode or negative terminal. In this, the source of positive charge carriers (i.e holes) is the anode or anode terminal or you can say positive terminal. The anode is a positively charged electrode or wire that charges the p-n junction with holes. On this type of junction, the cathode terminal is negative. The anode is a positive terminal in a forward-biased p-n junction diode (that p-type is linked to the positive terminal and n-type is connected to the negative). What happens in a forward-biassed semiconductor diode? Whereas all free electrons will start and all holes will end at the negative terminal. All free electrons will end their charges and all holes will begin at the positive terminal. The two terminals of a p–n junction diode are either positive or negative. In a p-n junction diode, the term terminal is a point where charge carriers begin their flow or stop. For example, a bus terminal or terminus is a place where all buses start their journey or stop for the day. In simple terms, a terminal is a point or place where the flow of current begins or stops. In the reverse system, the negative side is connected to the p-type and the n-type has the positive side of the terminal. If this diode is reversed the electric current doesn’t flow. Whereas the n-type semiconductor diode is connected to the negative side of the battery. In a p-type semiconductor, the positive terminal of the battery is under forwarding bias. The electric current that flows through the p-n junction diode is called a forward-biassed current. The external voltage that is applied to the p-n junction diode is done in two different ways i.e forward or reverse biassing technique. Providing an external voltage to a p-n junction semiconductor diode is called biassing. Biassing of p-n junction semiconductor diodes But due to the age-old notion, we always assume current flows from the positive to the negative terminal. On the other hand, free electrons move from the cathode (negative terminal ) to the anode (positive terminal). This flow is described as the conventional flow of current. These holes move from the anode i.e the positive terminal to the cathode which is the negative terminal. The Arrowhead of these diodes indicates the direction of flow of electric current that is from a positive terminal to the negative side in the forward-biassed diode. Whereas in reverse biassed it is vice versa. In a forward-biassed diode, the positive side is on the left and the negative side is on the right. But p-n junctions diodes are composed of germanium. Silicon works best for semiconductors because they work well in high temperatures. Silicon is used over germanium when creating these junction diodes. These materials are also used to make p-n junction diodes. But, p–n junction diodes are created due to the interlinking of p-type and n-type semiconductors.Ī semiconductor is made using materials such as silicon, germanium, and gallium arsenide. A p-n junction is formed when an n-type semiconductor is interlinked to a p-type semiconductor. Whereas holes are the majority charge carriers in p. The electrons which are free from bond carry charge carriers in n-type semicon type semiconductor sectors. P-N junction diode is used for passing the current in one direction. a p-n junction semiconductor diode is sometimes referred to as a p-n junction diode or semiconductor device. But if the diode is reversed biassed it blocks the electric current flow. The electric current flows if the diode is forward biassed. This diode helps in stopping the current in the reverse or opposite direction. It is a two-terminal or two electrode semiconductor device. A p-n junction diode is used for passing the current in one direction.
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