What is the theory of pn junction diode?

What is the theory of pn junction diode?

A PN-junction is formed when an N-type material is fused together with a P-type material creating a semiconductor diode.

What is pn junction diode explain with diagram?

P-N junction diode can be used as a photodiode as the diode is sensitive to the light when the configuration of the diode is reverse-biased.
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Applications of P-N Junction Diode.

What is diode and explain its chart?

diode, an electrical component that allows the flow of current in only one direction. In circuit diagrams, a diode is represented by a triangle with a line across one vertex. p-n junction characteristics. Key People: Nick Holonyak, Jr.

What is pn junction diode explain its characteristics?

Inside a semiconductor, a p-n junction is an interface or a border between two semiconductor material types, namely the p-type and the n-type. The semiconductor’s p-side, or positive side, has an excess of holes, whereas the n-side, or negative side, has an excess of electrons.

What is the symbol of pn junction?

The symbol for a p-n junction diode is a triangle pointing to a line. Where the triangle is pointing is showing you which way the diode will let current flow. This one is allowing current to flow from right to left with the right side being the positive side.

How pn junction diode is formed?

As diffusion continues, the space-charge regions on either side of the junction start extending. This strengthens the electric field and eventually the drift current. The process continues till diffusion current = drift current. This is how a p-n junction is formed.

What is pn junction diode and its application?

A p-n junction diode is a two terminal device that allows electric current in one direction and blocks electric current in another direction. In forward bias condition, the diode allows electric current whereas in reverse bias condition, the diode does not allow electric current.

What is the graph of reverse bias?

For reverse bias

Plot a graph between VR and IR taking VR on the negative x-axis and negative IR on the y-axis. The graph obtained is known as reverse bias characteristic curve.

What is the symbol of PN junction?

PN Junction Diode Symbol
The circuit symbol for a diode is an arrow and bar shown in Fig. 7.1. The arrowhead indicates the conventional direction of current flow when the diode is forward biased (i.e. from the positive terminal through the device to the negative terminal).

Why is PN junction used?

A p-n junction diode allows electric current when it is forward biased and blocks electric current when it is reverse biased. This action of p-n junction diode enables us to use it as a rectifier.

What is the main function of PN diode?

A p-n junction diode is two-terminal or two-electrode semiconductor device, which allows the electric current in only one direction while blocks the electric current in opposite or reverse direction. If the diode is forward biased, it allows the electric current flow.

Why pn junction is called a diode?

Why is p-n-junction is also called a junction diode? Solution : A p-n-junction allows a large current to flow through it when forward biased and it offers a high resistance when reverse biased. The unidirectional property is similar to that of vacuum diode. Hence, p-n-junction is also called a junction diode.

How do you graph forward and reverse bias?

Plot a graph between VF and IF taking VF on the x-axis and IF on the y-axis. The graph obtained is known as forward bias characteristic curve. Plot a graph between VR and IR taking VR on the negative x-axis and negative IR on the y-axis. The graph obtained is known as reverse bias characteristic curve.

Why is the graph of reverse bias in the third quadrant?

The junction diode characteristics are as shown in the figure The third quadrant represents the working of diode in reverse bias. As the reverse voltage is increased, the current does not increase much. But as soon as the voltage reaches breakdown point, the current increases suddenly.

How pn junction is formed?

P-n junctions are formed by joining n-type and p-type semiconductor materials, as shown below. Since the n-type region has a high electron concentration and the p-type a high hole concentration, electrons diffuse from the n-type side to the p-type side.

What is the characteristic curve of pn junction?

Volt-ampere (V-I) characteristics of a pn junction or semiconductor diode is the curve between voltage across the junction and the current through the circuit. Normally the voltage is taken along the x-axis and current along y-axis.

Why is a diode graph curved?

A typical characteristic curve for a diode is shown in Figure 1. This curve shows the variation of the diode current versus the voltage across the diode. On the right-hand side of the vertical axis (the current axis), a diode is forward biased because the voltage applied across it is positive.

What is the shape of graph of diode?

In general, one can say that a diode characteristic curve consists of three lines. This is true except around the origin, which is different. Remember that a voltage of 0.7 V is required for a silicon-based PN junction to conduct (0.3 V for germanium).

Why diode is non-linear?

A diode is a non-linear semiconductor device. Diode i- v curve of a silicon diode. This i- v curve is the element law for a diode. It clearly does not look like a straight line, so this is definitely not a linear device.

What is the difference between IV and VI graph?

Both the IV and VI graph shows the relation between potential V, and current I. In VI graph, we take potential at y-axis and current at x-axis. The slope of VI graph give us the resistance. In IV graph, Current is at y-axis and potential is at x-axis.

Is diode active or passive?

passive devices
Diodes are passive devices. Passive devices can only receive energy which can absorb, dissipate or store it in the magnetic field or electric field.

What kind of device is diode?

A diode is a semiconductor device that essentially acts as a one-way switch for current. It allows current to flow easily in one direction, but severely restricts current from flowing in the opposite direction.

What is the slope of VI graph?

(b) the slope of the V-I graph represents the resistance of the material. Q.

What is slope of IV graph?

the slope of I- V graph shows conductivity of the conductor or we can say inverse of resistance.

Is diode linear or nonlinear?

non-linear device
A diode is a non-linear device
This i- v curve is the element law for a diode. It clearly does not look like a straight line, so this is definitely not a linear device. The non-linear behavior of a diode is typical of other semiconductor devices like transistors. optional: A few details about the diode i-v curve.