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What Is An Intrinsic Semiconductor, The Difference Between An Intrinsic Semiconductor And A Semiconductor

What Is An Intrinsic Semiconductor, The Difference Between An Intrinsic Semiconductor And A Semiconductor

September 21 , 2023 0

This semiconductor will be purer compared to other semiconductor materials because of its unique design decision. Therefore, in the leached structure, intrinsic semiconductors have almost no other elements or chemicals, making intrinsic semiconductors the most desirable material for electrical properties.

Definition Of Intrinsic Semiconductor

Intrinsic semiconductors are semiconductor materials that are not doped with any impurities. These materials are usually crystals composed of a single element (e.g., silicon) or a compound (e.g., steel selenide). They contain only an equal number of holes and free electrons from the basic element or compound, and do not produce any external impurities that affect their electrical properties directly.

Significance Of The Presence Of Semiconductors In This Sign

The spread of the use of storage and computer technology has made the physical phenomena of semiconductors increasingly important. The unique properties of intrinsic semiconductors have become even more important. When a voltage is applied to an intrinsic semiconductor, the electrons in it move to a region of high electric field, leaving behind a corresponding number of positive holes and creating a plasma. This process is known as carrier excitation. In this case, there are a number of carriers (free electrons and positive holes) in the electric field that can be transported, creating an electric current.

Characteristics Of Intrinsic Semiconductors

Intrinsic semiconductors have the following main characteristics.

They do not contain any external impurities inside that can affect the electrical properties and hence are highly stable .
The concentration of holes/electrons is determined by temperature and increases as the temperature rises.
Possesses non-linear resistance properties typical of semiconductors
Doping intrinsic semiconductors with other substances (e.g. boron) can change their electrical properties, resulting in semiconductor devices such as PN junctions and point contact diodes.

Carrier Concentration In This Evidence Semiconductor

In this type of semiconductor, once the valence electrons break the covalent bond and move into the conduction band, two types of charge carriers are created, such as empty sixes and free electrons The number of electrons per unit volume within the conduction band and the number of holes per unit volume within the valence band is called the carrier concentration in the intrinsic semiconductor. Similarly, the electron carrier concentration can be defined as the number of electrons per unit volume in the conduction band and the number of holes per unit volume in the valence band is called the hole carrier concentration.
In an intrinsic semiconductor, the electrons generated in the conduction band can be equated to the holes generated in the valence band. Therefore, the concentration of electron carriers is equal to the concentration of hole carriers, so it can be written as.
ni = n = p
where "n" is the concentration of electron carriers, "P" is the concentration of hole carriers, and "ni" is the concentration of intrinsic carriers.
In the valence band, the concentration of holes can be written as.
P = Nv e -(E F-E V)/K B T
In the conduction band, the concentration of electrons can be written as: N = P = Nc e - (E F-E V)/K B T
N = P = Nc e -(E C-E F)/K B T
In the above equation, "KB" is the Boltzmann constant, "T" is the total temperature of the intrinsic semiconductor, "Nc" is the effective density of states in the conduction band, and Nv is the effective density of states in the valence band.

Difference Between Intrinsic And Non-intrinsic Semiconductors

As can be seen from the above introduction, pure semiconductors that do not contain impurities, such as the concentration of electrons and holes within them, are called intrinsic semiconductors. Intrinsic semiconductors are not suitable for making semiconductor devices because the performance of the devices made from them is very unstable.
In contrast, semiconductors doped with a certain amount of impurities are called non-intrinsic semiconductors or impurity semiconductors, which are the materials actually used to make semiconductor devices and integrated circuits.